Criticise a master's hat! (6)

I believe the answer is:

panama

'hat' is the definition.
(I know that Panama is a type of hat)

'criticise a master's' is the wordplay.
'criticise' becomes 'pan' (informal term meaning to criticise heavily).
'master' becomes 'ma' (Master of Arts).
'pan'+'a'+'ma'='PANAMA'

(Other definitions for panama that I've seen before include "isthmus" , "Wide-brimmed hat" , "Great canal in middle America" , "Great canal connecting Atlantic and Pacific" , "Land - hat - cigar" .)

I've seen this clue in the Evening Standard.

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