Crossword Genius

A hundred certain to have monk's hairstyle (7)

Ross

I believe the answer is:

tonsure

'monk's hairstyle' is the definition.
(tonsure means a monk's shaven head)

'a hundred certain' is the wordplay.
'a hundred' becomes 'ton' (I've seen this before).
'certain' becomes 'sure' (similar in meaning).
'ton'+'sure'='TONSURE'

'to have' acts as a link.

(Other definitions for tonsure that I've seen before include "Haircut for a monk" , "Close-shaved hairstyle" , "Monk's bald spot" , "Shaven spot on monk's head" , "Monk's hairdo" .)

I've seen this clue in The Irish Independent.
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