Fat-headed bird? (4)

I believe the answer is:

fowl

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

'fat-headed bird?' is the definition.
'fowl' can be an answer for 'bird?' ('fowl' can be a synonym of 'bird'). I'm not certain of the 'fat-headed' bit.

'fat-headed bird?' is the wordplay.
'fat-headed' becomes 'f' (this might be a standard abbreviation I've not previously seen).
'bird?' becomes 'owl' (owl is a kind of bird).
'f'+'owl'='FOWL'

Can you help me to learn more?

(Other definitions for fowl that I've seen before include "Domesticated bird" , "Poultry bird" , "eg hen" , "eg Chicken" , "Domestic birds" .)

I've seen this clue in the Evening Standard.

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