Possible wrong County of Ireland cited due to multiple places named Clogher.
"Ireland, Diocesan and Prerogative Marriage License Bonds Indexes, 1623-1866," database, FamilySearch (https://familysearch.org/ark:/61903/3:1:3QS7-994F-MZB9?cc=3460239 : 15 October 2019), > image 1 of 1; extracted by FindMyPast. Images digitized by FamilySearch. National Archives of Ireland, Dublin.
On the individual's card in the family tree (Jane Oliver) (Clement Nelson) showing marriage license bonds as the source it states the place of marriage was "Clogher, County Mayo". However looking at the image of the record it states the "Diocese of Clogher, Ireland". The Diocese (Church of Ireland) of Clogher covers many parishes in Co. Monaghan and some in Co. Fermanagh and Co. Tyrone. I am not the person who added the source (which I believe is correct) to the record. I don't know if I can change the "Co. Mayo" myself.