Travelling urbanite ditching a motor (7)
I believe the answer is:
turbine
'motor' is the definition.
(turbine is a kind of motor)
'travelling urbanite ditching a' is the wordplay.
'travelling' is an anagram indicator.
'ditching' is a deletion indicator.
'urbanite' with 'a' removed is 'urbnite'.
'urbnite' with letters rearranged gives 'TURBINE'.
(Other definitions for turbine that I've seen before include "Machine generating power" , "Rotary motor" , "Machine driven by tribune" , "Source of power" , "Power-producing motor" .)