Priests organised in bands (7)
I believe the answer is:
stripes
'bands' is the definition.
(I know this)
'priests organised' is the wordplay.
'organised' is an anagram indicator.
'priests' anagrammed gives 'STRIPES'.
'in' is the link.
(Other definitions for stripes that I've seen before include "punishment" , "Insignia of rank" , "Persist (anag)" , "They are given to corporal" , "As standard feature" .)