Crossword Genius

Vehicle fuel production is prudent (7)

Ross

I believe the answer is:

careful

'prudent' is the definition.
(associated in meaning)

'vehicle fuel production' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'production' is an anagram indicator.
'fuel' is an anagram of 'eful'.
'car'+'eful'='CAREFUL'

'is' is the link.

(Other definitions for careful that I've seen before include "Painstaking" , "Diligent" , "Attentive" , "Watch it!" , "'Prudent, cautious (7)'" .)

I've seen this clue in The Daily Express.
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