Team about to board Bill's vehicle (7)
I believe the answer is:
taxicab
'vehicle' is the definition.
(taxicab is a kind of vehicle)
'team about to board bill's' is the wordplay.
'team' becomes 'XI' (a football team, from Roman numerals for cc).
'about' becomes 'ca' (circa).
'to board' indicates putting letters inside (inserted letters come on board).
'bill' becomes 'tab' (a tab is a bill at a bar).
'xi'+'ca'='xica'
'xica' put within 'tab' is 'TAXICAB'.
(Other definitions for taxicab that I've seen before include "Licensed passenger vehicle" , "Vehicle for hire" , "transport" , "Hire car" .)