It's an entry, probably in an Act book of the ecclesiastical Court, recording (in essence) that on the 25th day of September 1705 the will of Thomas Cremer of the parish of St Margaret in the City of Westminster was proved by the oath of Ann Cremer the sole executrix named in the same will.
I think you found this in the Westminster, London, England, Wills and Probates, 1504-1829 collection on Ancestry. I assume you also have Thomas Cremer's will from the same source?
This won't add anything significant to what you have from the will.