Crossword Genius

They won't stand for being models (7)

Ross

I believe the answer is:

sitters

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sitters that I've seen before include "Easy catches" , "Models" .)

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