Usual practice of a bishop wearing belt (5)
I believe the answer is:
habit
'usual practice' is the definition.
(I've seen this before)
'a bishop wearing belt' is the wordplay.
'bishop' becomes 'B' (chess abbreviation).
'wearing' indicates putting letters inside.
'belt' becomes 'hit' (I've seen this in another clue).
'a'+'b'='ab'
'ab' put into 'hit' is 'HABIT'.
'of' acts as a link.
(Other definitions for habit that I've seen before include "It's second nature" , "Usual practice; garment" , "Monk's garb" , "Regular practice" , "Riding garment" .)