Crossword Genius

The boss, heated after losing a couple of letters? (4)

Ross

I believe the answer is:

head

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'the boss' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for head that I've seen before include "Noggin" , "School boss" , "Leader; water pressure" , "Be in charge of; (come to) crisis" , "bean" .)

I've seen this clue in the Evening Standard.
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