Go round a church, finding source of strength? (7)
I believe the answer is:
spinach
'source of strength?' is the definition.
(for Popeye at least)
'go round a church' is the wordplay.
'go round' becomes 'spin' (I've seen this before).
'church' becomes 'ch' (common abbreviation).
'spin'+'a'+'ch'='SPINACH'
'finding' is the link.
(Other definitions for spinach that I've seen before include "leaves on plate?" , "Some greens" , "Popeye the Sailor's favourite vegetable" , "Popeye's vegetable" , "Popeye the Sailor's vegetable of choice" .)