Bluish-grey pan (5)
I believe the answer is:
slate
I believe this is a double definition.
'bluish-grey' is the first definition.
(slate is a shade of bluish grey)
'pan' is the second definition.
(both can mean to criticise)
(Other definitions for slate that I've seen before include "Grey metamorphic rock" , "Bluish-grey colour" , "Scold; hard rock" , "Blast" , "rock used in building" .)