Crossword Genius

Looked resentful in broadcast (6)

Ross

I believe the answer is:

peeked

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'looked' is the definition.
(peeking is a kind of looking)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for peeked that I've seen before include "Glanced surreptitiously" , "Looked surreptitiously" , "Took a secret look" , "Looked furtively" .)

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