Crossword Genius

Model missed by out of form striker (6)

Ross

I believe the answer is:

sitter

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'model' is the definition.
(I know that model is a type of model)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sitter that I've seen before include "Easy shot or catch" , "Extremely easy task" , "broody type" , "Dolly" , "One minds the baby" .)

I've seen this clue in The Irish Times.
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