Severely criticise Peter in theatre (3)
I believe the answer is:
pan
This clue might be a double definition.
'severely criticise' is the first definition.
(pan can mean to criticise heavily)
'peter in theatre' is the second definition.
'pan' can be an answer for 'peter' (I've seen this in other clues). I am not certain of the 'in theatre' bit.
Can you help me to learn more?
(Other definitions for pan that I've seen before include "Arcadian god" , "Criticise - cooking vessel" , "Greek nature god" , "Greek god of flocks and heards" , "God of fields and woods" .)