Bike was blue (5)
I believe the answer is:
moped
I believe this clue is a double definition.
'bike' is the first definition.
(moped is a kind of bike)
'was blue' is the second definition.
(past tense of 'mope')
(Other definitions for moped that I've seen before include "Motor cycle -- sulked" , "Motor vehicle - languished" , "Light motor cycle" , "Light motorbike" , "Power-assisted vehicle" .)