The old man having issues over leisure activity (7)
I believe the answer is:
pastime
'leisure activity' is the definition.
(I've seen this before)
'the old man having issues over' is the wordplay.
'the old man' becomes 'pa' (both can mean someone's father).
'having' is a charade indicator (letters next to each other).
'issues' becomes 'emits' (I've seen this in another clue).
'over' is a reversal indicator.
'emits' reversed gives 'stime'.
'pa'+'stime'='PASTIME'
(Other definitions for pastime that I've seen before include "Leisure pursuit" , "relaxation" , "Hobby; regular activity" , "Hobby - recreation" , "Leisure activity" .)