Priest disturbed band (6)
I believe the answer is:
stripe
'band' is the definition.
(I know that band can be written as stripe)
'priest disturbed' is the wordplay.
'disturbed' indicates anagramming the letters (the order of letters is disturbed).
'priest' anagrammed gives 'STRIPE'.
(Other definitions for stripe that I've seen before include "Priest (anag)" , "Band of colour, maybe of rank" , "Long narrow mark found in tripes" , "Chevron; band" , "Chevron on a uniform to denote military rank" .)