Abandon by the roadside (5)
I believe the answer is:
ditch
'abandon' is the definition.
(ditching is a kind of abandoning)
'the roadside' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
The remaining letters 'dich' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'by' acts as a link.
Can you help me to learn more?
(Other definitions for ditch that I've seen before include "Abandon - trench" , "Get rid of; dug channel" , "give up" , "Moat" , "Narrow channel" .)