Crossword Genius

Executed highlights in hair (7)

Ross

I believe the answer is:

tresses

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for tresses that I've seen before include "Long braids of hair" , "The hair of the head" , "Long locks of hair" .)

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