Crossword Genius

Growing tired of signalling? (8)

Ross

I believe the answer is:

flagging

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'signalling?' is the definition.
(flagging is a kind of signaling)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for flagging that I've seen is " Losing vigour, becoming weak".)

I've seen this clue in The Globe and Mail.
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