Tim:
Killerk East and Killerk West townlands are in the civil parish of Killone and the related RC parish is Killone/Clarecastle/Clare Abbey.
The baptismal records for that parish start in December 1853 and marriages start in January 1854. Therefore, if Bridget and John were from that parish and left in 1841, no records would be available for the couple or their children. ( I did check the subscription site Roots Ireland to be sure and did not see any records). https://registers.nli.ie/parishes/0761
The 1855 Griffiths Valuation head of household listing for Killone civil parish https://www.failteromhat.com/griffiths/clare/killone.htm ; shows two Cleary records Patrick and Peter, however, they were not in Killerk but could be related to Bridget. There were no Ahern records listed.
The Tithe records for Killone civil parish likely from the late 1820s show two Cleary records for a Patrick and Denis. No Ahern records.
http://titheapplotmentbooks.nationalarchives.ie/search/tab/results.jsp?…
The Co. Clare Library has extensive genealogy info which may be helpful to you but they won't have any baptismal or marriage records for your family. https://www.clarelibrary.ie/eolas/coclare/genealogy/genealog.htm
Have you considered DNA testing?
Let me know if you have any questions.
Roger McDonnell
