Drive on (4)

I think it could be either:

Which length description are you looking for?:

impel

'drive on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for impel that I've seen before include "Make" , "Urge forward - push" , "Spur on" , "Urge or force to action" , "Send or drive forward" .)

I've seen this clue in The Guardian and The Telegraph.

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