A hat-trick may go to his head! (6)

I believe the answer is:

bowler

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

I cannot understand how the rest of the clue works.

(Other definitions for bowler that I've seen before include "One who can deliver" , "something more substantial than a cap" , "Derby" , "Hard hat for cricketer?" , "See 8" .)

I've seen this clue in the Evening Standard.

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