Crossword Genius

Substitute endlessly on his feet? (5-2)

Ross

I believe the answer is:

stand-in

I'm a little stuck... Click here to teach me more about this clue!

'substitute' is the definition.
(I know that substitute can be written as stand-in)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for stand-in that I've seen is " Substitute".)

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