Crossword Genius

Fast vehicle ditched by Shell? (5)


I believe the answer is:


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'fast' is the definition.
(apace can mean quickly)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for apace that I've seen before include "flat out" , "(Move on) swiftly" , "Swiftly, quickly" , "Quick" , "At a rapid rate" .)

I've seen this clue in The Guardian.
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