Ring cleric when upset (6)
I believe the answer is:
circle
'ring' is the definition.
(synonyms)
'cleric when upset' is the wordplay.
'when upset' is an anagram indicator.
'cleric' is an anagram of 'CIRCLE'.
(Other definitions for circle that I've seen before include "Theatre tier; go round" , "Geometric shape" , "Round shape" , "Draw line around (something)" , "Closed plane curve" .)