In Ireland, fine assistant for hire by older relative (11)
I believe the answer is:
grandparent
'older relative' is the definition.
(I've seen this before)
'in ireland fine assistant for hire' is the wordplay.
'in ireland fine' becomes 'grand' (I can't explain this - if you can you should give a lot more credence to this answer).
'assistant' becomes 'PA' (personal assistant).
'for' is a charade indicator (letters next to each other).
'hire' becomes 'rent' (synonyms).
'grand'+'pa'+'rent'='GRANDPARENT'
'by' is the link.
Can you help me to learn more?
(Other definitions for grandparent that I've seen before include "Older relative" , "Relative two generations removed" , "one of the family members" .)