Green or red ancillary vehicle (6)
I believe the answer is:
tender
This clue is a triple definition!
'green' is the first definition.
(thesaurus)
'or' acts as a link.
'red' is the second definition.
(thesaurus)
'ancillary vehicle' is the third definition.
(I've seen this before)
(Other definitions for tender that I've seen before include ". . . . . . is the Night (F. Scott Fitzgerald)" , "Offer - present - gentle - nurse" , "Delicate sort of bid" , "Soft, delicate or loving" , "pathetic water-carrier, say" .)