Some question of a pointed hat (4)

I believe the answer is:

what

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'some question of a' is the definition.
I can't tell whether this defines the answer.

'pointed hat' is the wordplay.
'pointed' becomes 'w' (I can't explain this - if you can you should give a lot more credence to this answer).
'w'+'hat'='WHAT'

Can you help me to learn more?

(Other definitions for what that I've seen before include "I beg your pardon" , "Eh?" , "Which thing?" , "I didn't hear" , "Interrogatory word" .)

I've seen this clue in the Evening Standard.

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