They reward or punish unruly priests (7)
I believe the answer is:
stripes
'they reward or punish' is the definition.
The definition suggests an adverb but the answer is not.
'unruly priests' is the wordplay.
'unruly' indicates an anagram.
'priests' with letters rearranged gives 'STRIPES'.
Can you help me to learn more?
(Other definitions for stripes that I've seen before include "Chevrons on uniforms" , "Bands of contrasting colours" , "Insignia of rank" , "See 17" , "Bands or lines" .)