Is this the one who was buried in Harrold on 6 July 1813 age 31? I hope so otherwise I've wasted my time! As Suz says, it helps if you tell us what other information you already have - eg wife, kids etc
The IGI at
www.familysearch.org has two marriages in Harrold for a Thomas Clayson in 1803 to Martha Bradshaw and 1811 to Keziah Robinson - it may be the same Thomas as a Martha Clayson age 35 was buried at Harrold on 12 July 1810. It would be useful to check these entries to see what other detail they contain.
Virtually all of Beds baptisms and marriages pre 1813 have been extracted onto the IGI. I can't see a baptism in Beds for him. Perhaps he wasn't baptised in Beds or perhaps his family was non-conformist and he wasn't baptised in the established church. There were Clayson burials in Harrold from 1759 onwards so they were already in the village although the first baptism wasn't until 1805 when there two on the same day, one to Thomas & Martha and the other to Zachariah & Ann*. I can't find any Zachariah Claysons anywhere on the IGI.
The 1803 Muster List for Harrold shows:
Thomas Clason, mason, 21 Class 1 ie men between 17-30
unmarried
Zaccaus Clason, mason, 50, no children under 10, class 4 ie men aged 17-55, married over 30
Zaccheus Clayson aged 84 was buried on 1 Dec 1836 and Ann Clayson aged 60 on 2 Sep 1813
Thomas might have been a son of Zacc and Ann but I can't prove it as I can't find a marriage after Zacc's first wife died
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Harrold Congregational Church records refer to Claysons, but no mention of Zacc -
http://www.nationalarchives.gov.uk/A2A/records.aspx?cat=004-x377&cid=-1&Gsm=2008-06-18#-1The BLARS catalogue at
http://blars.adlibsoft.com/ shows that Thomas Clayson was admitted to Harrold Congregation Church in 1811 and died on 6 July 1813, and Zach was a member too
edit - but I can't tell if it was senior or junior - possibly the formerI can't see that either Zach or Thomas left wills, although both BLARS and A2A mention other Clayson wills from Harrold, but again no mention of either Zach or Thomas.
At 5 a.m. I'm going back to bed to see if I can sleep this time!
David
* Later - I can't see a marriage of Zachariah and Ann, but the IGI has three marriages of Zaccheus in Harrold - 1779, 1816 and 1822. You need to check the parish register to see if the third one was a widower - the 1816 marriage was to Priscilla, and Zaccheus and Priscilla were in Harrold in 1841, both aged 50.
The 1779 marriage was to Catherine, and she appears to have been buried on 16 May 1780