Entering Malmo, vehicles advance (4)
I believe the answer is:
move
'advance' is the definition.
(thesaurus)
'entering malmo vehicles' is the wordplay.
'entering' indicates a hidden word.
'MOVE' is hidden in the letters of 'malmo vehicles'.
(Other definitions for move that I've seen before include "Stir - change places" , "Go; change opinion" , "Affect" , "Proceed" , "Go, transport" .)