Crossword Genius

Retreating supporters? (7)

Ross

I believe the answer is:

backing

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

'retreating' is the definition.
The answer and definition can be both to do with motion as well as being present participle verbs.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for backing that I've seen before include "change of wind" , "promotion" , "Withdrawing" , "Endorsement" , "funds?" .)

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