Sulked on a bike (5)
I believe the answer is:
moped
I believe this is a double definition.
'sulked' is the first definition.
(I've seen this before)
'bike' is the second definition.
(I know that moped is a type of minibike)
'on a' acts as a link.
(Other definitions for moped that I've seen before include "Vehicle - was blue" , "Languidly moved" , "Despaired" , "Brooded, hung about" , "Mooned around" .)