Crossword Genius

A bitter drunk — it may go to cardinal's head (7)

Ross

I believe the answer is:

biretta

'it may go to cardinal's head' is the definition.
(cap worn by clergy)

'a bitter drunk' is the wordplay.
'drunk' indicates an anagram.
'a'+'bitter'='abitter'
'abitter' anagrammed gives 'BIRETTA'.

(Other definitions for biretta that I've seen before include "Battier (anag.)" , "religious headwear" , "Square cap worn by Roman Catholic clergy" , "Cloth cap" , "Cleric takes this on himself" .)

I've seen this clue in The Times.
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