Piece of tiling on church blokes fix (6)
I believe the answer is:
cement
'fix' is the definition.
(I know this)
'piece of tiling on church blokes' is the wordplay.
'piece of' says to take the initial letters.
'on' says to put letters next to each other.
'church' becomes 'CE' (abbreviation for Church of England).
'blokes' becomes 'men' (bloke can informally mean a man).
The initial letter of 'tiling' is 't'.
'ce'+'men'='cemen'
't' put after 'cemen' is 'CEMENT'.
(Other definitions for cement that I've seen before include "Bond firmly" , "material for bonding" , "Powder used to make concrete" , "Stuff that binds or bonds" , "Firmly fix" .)