Hunter's hat (11)
I believe the answer is:
deerstalker
'hunter's hat' is the definition.
(I've seen this before)
'hunter's' is the wordplay.
I cannot quite understand how this works, but
'hunter' could be 'stalker' (stalker is a kind of hunter) and 'stalker' is present in the answer.
The remaining letters 'deer' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for deerstalker that I've seen before include "Sherlock Holmes' hat" , "it goes to one's head" , "Soft cloth hat" , "Holmes's hat" , "Type of cloth cap" .)