Apply to a prince for a chaplain (8)
I believe the answer is:
approach
'apply to' is the definition.
(thesaurus)
'a prince for a chaplain' is the wordplay.
'prince' becomes 'p' (abbreviation).
'for' becomes 'pro' (as in being 'pro' something).
'chaplain' becomes 'ch' (I've seen this in other clues).
'a'+'p'+'pro'+'a'+'ch'='APPROACH'
(Other definitions for approach that I've seen before include "Advance towards" , "Avenue" , "golf shot" , "technique" , "Come near or nearer to" .)