The nut in charge (4)

I believe the answer is:

head

I believe this clue is a double definition.

'the nut' is the first definition.
(thesaurus)

'in charge' is the second definition.
(thesaurus)

(Other definitions for head that I've seen before include "Chief; go first" , "River source; promontory" , "Leader; water pressure" , "Person in charge" , "John on board" .)

I've seen this clue in the Evening Standard.

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