Some question of a new hat? (4)
I believe the answer is:
what
'some' is the definition.
Both the answer and definition are adverbs.
Perhaps they are linked in a way I don't understand?
'question of a new hat?' is the wordplay.
'WHAT' is hidden within the letters.
However, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for what that I've seen before include "That which - come again!" , "Interrogatory word" , "I beg your pardon" , "Word used in a question" , "I didn't hear" .)