Crossword Genius

Deputy in vehicle heading northbound (3)

Ross

I believe the answer is:

sub

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'deputy' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for sub that I've seen before include "Advance payment" , "Warship; membership fee" , "Prefix meaning beneath" , "Type of sandwich" , "Underwater boat" .)

I've seen this clue in The Times.
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