If going overland you'll need a cab (6)

I believe the answer is:

fiacre

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

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

(Other definitions for fiacre that I've seen before include "Old coach" , "Four-wheeled carriage" , "cab" .)

I've seen this clue in The Globe and Mail.

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