Buzzing bee in a close-fitting hat (6)

I believe the answer is:

beanie

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

'hat' is the definition.
(I've seen this before)

'buzzing bee in a close-fitting' is the wordplay.
'bee in a' can be anagrammed to 'BEANIE'.
Though, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for beanie that I've seen before include "Small close-fitting hat" , "one on the head" , "Topping" , "cap" .)

I've seen this clue in The Sun.

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