Last in queue after free travel (4)
I believe the answer is:
ride
'travel' is the definition.
(riding is a kind of travelling)
'last in queue after free' is the wordplay.
'last in' indicates one should take the final letters.
'after' means one lot of letters go next to another.
'free' becomes 'rid' ('rid' can be a synonym of 'free'**).
The final letter of 'queue' is 'e'.
'e' put after 'rid' is 'RIDE'.
(Other definitions for ride that I've seen before include "Journey on horse?" , "Lie at anchor" , "Sit on (a horse/vehicle)" , "Travel, on horseback, say" , "Take a trip" .)