Two-wheeled vehicle (7)
'two-wheeled vehicle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bicycle that I've seen before include "Pedalled vehicle" , "M an-powered vehicle" , "Two-wheeled transport" , "Lowest values" , "Form of transport" .)
(Other definitions for motorbike that I've seen before include "Transport" , "Two-wheeler" .)