Crossword Genius

Shell makes vehicle fast! (8)

Ross

I believe the answer is:

carapace

'shell' is the definition.
('carapace' can be a synonym of 'shell')

'vehicle fast' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'fast' becomes 'apace' ('apace' can be a synonym of 'fast').
'car'+'apace'='CARAPACE'

'makes' acts as a link.

(Other definitions for carapace that I've seen before include "Protective cover" , "Upper shell of tortoise" , "Shell on back of tortoise or crustacean" , "Hard thick shell, of a turtle say" , "Pace a car around a shell, of a tortoise say" .)

I've seen this clue in The Telegraph.
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