A model you shouldnt miss (6)

I believe the answer is:

sitter

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'a model' is the definition.
(I know that model can be written as sitter)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sitter that I've seen before include "Model - childminder" , "eyed by a drawer?" , "Artist's model - an easy catch" , "Child-minder of sedentary disposition" , "Dolly" .)

I've seen this clue in The Irish Independent.

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