Get on European service to return (4)
I believe the answer is:
fare
'get on' is the definition.
(thesaurus)
'european service to return' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'service' becomes 'raf' (**).
'to return' says the letters should be written in reverse.
'e'+'raf'='eraf'
'eraf' written backwards gives 'FARE'.
(Other definitions for fare that I've seen before include "Grip (of a tyre)" , "Transport charge" , "Taxi hire cost" , "Payment for journey" , "Cost of travel" .)