Impress upon, during the trip back (5,4)

I believe the answer is:

drive home

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'impress' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for drive home that I've seen before include "What some commuters do after work" , "Force (a nail) completely in" , "Make especially clear" , "Emphasise - return to one's abode?" , "evening commute?" .)

I've seen this clue in the Evening Standard.

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