Father, friend of the Pope? (5)
I believe the answer is:
papal
'of the pope?' is the definition.
(I've seen this before)
'father friend' is the wordplay.
'father' becomes 'pa' (pa is a kind of father).
'friend' becomes 'pal' (pal is a kind of friend).
'pa'+'pal'='PAPAL'
(Other definitions for papal that I've seen before include "Of the highest Vatican authority" , "Relating to the Pontiff" , "Like some bulls" , "Of the RC leader" , "Relating to the Pope" .)