Crossword Genius

Presumably the boss has one!

Ross

I believe the answer is:

head

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'one' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for head that I've seen before include "Leader; water pressure" , "Lead - school principal" , "See 14" , "See 25" , "''and still the wonder grew / That one small ... could carry all he knew'' (Goldsmith)" .)

I've seen this clue in The Irish Independent.
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