Crossword Genius

The boss is a nut! (4)

Ross

I believe the answer is:

head

I believe this is a double definition.

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

'a nut' is the second definition.
(thesaurus)

'is' is the link.

(Other definitions for head that I've seen before include "Leader; stream source" , "Source of river, leader" , "Noggin" , "River or stream source" , "Edible part of cabbage" .)

I've seen this clue in the Evening Standard.
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