A capital boss (4)

I believe the answer is:

head

This clue is a double definition.

'a capital' is the first definition.
(thesaurus)

'boss' is the second definition.
(synonyms)

(Other definitions for head that I've seen before include "Cranium" , "Chief; promontory" , "Froth on beer" , "Noggin" , "See 12" .)

I've seen this clue in the Evening Standard.

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