Old Frenchman to chuck out retro American vehicle (7)
I believe the answer is:
omnibus
'vehicle' is the definition.
(I've seen this before)
'old frenchman to chuck out retro american' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'to chuck out' becomes 'bin'.
'retro' says the letters should be written in reverse (retro is Latin for 'backwards').
'american' becomes 'us'.
'bin' in reverse letter order is 'nib'.
'o'+'m'+'nib'+'us'='OMNIBUS'
(Other definitions for omnibus that I've seen before include "book collection" , "Several books in one" , "Anthology" , "Passenger-carrier" , "public service" .)