Fellow taking a piano to church! (4)
I believe the answer is:
chap
'fellow' is the definition.
(both can mean a man)
'a piano to church' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'church' becomes 'ch' (common abbreviation).
'a'+'p'='ap'
'ap' put after 'ch' is 'CHAP'.
'taking' acts as a link.
(Other definitions for chap that I've seen before include "(Of skin) become sore" , "Fellow < makes > crack" , "Skin crack due to cold - bloke" , "Fellow; sore skin area" , "Cracked patch (of skin) - gentleman" .)