My apologies for the delay in replying to your last post - if you get in touch with Deirdre in Seattle she has my details. We have as much information as you, though I think the Cloonclare connection is a different Clancy family. In Ireland, there are traditional naming schemes - e.g. you might have a lot of Johns and Peters in a Murphy family for example, and there might be a lot of Murphys in Cork, for example - so this makes genealogy very tricky indeed. Local knowledge is what is really needed to get the precision in Irish genealogy.
John William Clancy had a brother called Thomas Ennis Clancy, and his mother was Eliza Jane Clancy (Lilly was called after her it could be assumed). I have done further research online on Irish search engines and FindMyPast through subscription and found further information on the Ennis family - though not very much. Some information is freely available online.
@Gortonboy - thank you very much for all your help in this thread, it really was of great assistance in researching our fragmentary family and well scattered family tree. I am unable to locate him precisely on the Chelsea Army Pensioner records though I am determined and will do it!
Also, the very first I completely misread bugler as burglar! I though he was a criminal in my misreading of the text!