Spurious attempt to rise in vehicle (5)
I believe the answer is:
bogus
'spurious' is the definition.
(I've seen this before)
'attempt to rise in vehicle' is the wordplay.
'attempt' becomes 'go' (go is a kind of attempt).
'to rise' says the letters should be written in reverse.
'in' indicates putting letters inside.
'vehicle' becomes 'bus' (public transport vehicle).
'go' reversed gives 'og'.
'og' inserted within 'bus' is 'BOGUS'.
(Other definitions for bogus that I've seen before include "Not true" , "taking one for a ride?" , "Fake, phoney" , "Sham, false" , "Spurious" .)