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' says to put letters next to each other (I've seen this in other clues).
'church' becomes 'ch' (common abbreviation).
'a'+'p'='ap'
'ap' 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" .)