Crossword Genius

… compiler wears this bowler out? Oh, please! (2,3)

Ross

I believe the answer is:

my hat

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'oh please' is the definition.
(expression of disbelief)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for my hat that I've seen before include "Exclamation of surprise" , "Old-fashioned exclamation" , "Out of respect I might remove this" , "nonsense" , "I refuse to believe" .)

I've seen this clue in The Guardian.
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