Crossword Genius

Principal nut (4)

Ross

I believe the answer is:

head

This clue is a double definition.

'principal' is the first definition.
(synonyms)

'nut' is the second definition.
(I've seen this in other clues)

(Other definitions for head that I've seen before include "Leader; water pressure" , "Beer foam; front" , "River or stream source" , "John on board" , "Leader; front" .)

I've seen this clue in the Sydney Morning Herald.
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