Not in motion yet (5)

I believe the answer is:

still

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'yet' is the definition.
(I know that yet can be written as still)

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

Can you help me to learn more?

(Other definitions for still that I've seen before include "Even now; not moving" , "Motionless, not sparkling" , "Static photograph" , "It's not effervescing" , "gentle" .)

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