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Without a present, cancels and drives back (6)

Ross

I believe the answer is:

repels

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'drives back' is the definition.
('repel' can be a synonym of 'drive back')

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for repels that I've seen before include "Drives back or disgusts (6)" , "Forces back" , "Drives away from lepers" , "Disgusts or drives away" .)

I've seen this clue in The Telegraph.
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