Two-wheeled transport was miserable (5)
I believe the answer is:
moped
This clue could be a double definition.
'two-wheeled transport' is the first definition.
'moped' can be an answer for 'transport' (moped is a kind of transport). I am not certain of the 'two-wheeled' bit.
'miserable' is the second definition.
(I've seen this before)
'was' is the link.
Can you help me to learn more?
(Other definitions for moped that I've seen before include "Light motorbike" , "Brooded, hung about" , "Motorised bicycle" , "Light motor cycle" , "Two-wheeled vehicle" .)