Fillet joint for the bishop (5)
I believe the answer is:
mitre
'fillet joint' is the definition.
'mitre' can be an answer for 'joint' (mitre joint is a kind of joint). I am not certain of the 'fillet' bit.
'the bishop' is the wordplay.
I cannot really see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'mire' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for mitre that I've seen before include "Timer (anag.)" , "Merit (anag.)" , "What a bishop may have on" , "A bishop wears it" , "Remit (anag.)" .)