Crossword Genius

A question of western headgear (4)

Ross

I believe the answer is:

what

I'm a little stuck... Click here to teach me more about this clue!

'a question of western headgear' is the definition.
I can't judge whether this defines the answer.

'western headgear' is the wordplay.
'western' becomes 'w'.
'headgear' becomes 'hat' (hat is a kind of headgear).
'w'+'hat'='WHAT'

Can you help me to learn more?

(Other definitions for what that I've seen before include "Eh?" , "I didn't hear" , "Which thing?" , "That which - come again!" , "Interrogatory word" .)

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