Crossword Genius

One of the overheads for a gangster (4)

Ross

I believe the answer is:

hood

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

'a gangster' is the definition.
(I've seen this in another clue)

'one of the overheads' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is found in the answer.
The remaining letters 'hod' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'for' acts as a link.

Can you help me to learn more?

(Other definitions for hood that I've seen before include "Thomas -, Eng. poet" , "Cowl -- violent criminal (slang)" , "See 5" , "Protective cover - violent criminal (slang)" , "See 13" .)

I've seen this clue in the Evening Standard.
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