Bit from bird landing on church (5)
I believe the answer is:
piece
'bit' is the definition.
(I know that bit can be written as piece)
'bird landing on church' is the wordplay.
'bird' becomes 'pie' (sort of bird).
'landing on' is a charade indicator (letters next to each other) (in a down clue, some letters go on top of others).
'church' becomes 'CE' (abbreviation for Church of England).
'pie'+'ce'='PIECE'
'from' is the link.
(Other definitions for piece that I've seen before include "Castle, perhaps" , "Musical work; bit" , "King, perhaps" , "Queen on board, perhaps" , "Slice" .)