Have guests come into vehicle with no right? (9)
I believe the answer is:
entertain
'have guests' is the definition.
(as in entertaining or hosting guests)
'come into vehicle with no right?' is the wordplay.
'come into' becomes 'enter' (to enter a building is to come into it).
'vehicle' becomes 'train'.
'with no' is a deletion indicator.
'right?' becomes 'r' (common abbreviation).
'train' with 'r' removed is 'tain'.
'enter'+'tain'='ENTERTAIN'
(Other definitions for entertain that I've seen before include "Please < flirt with" , "Amuse - give hospitality" , "Play host to" , "Think about" , "Put up" .)