Don't stop waving to a truck! (5)
I believe the answer is:
wagon
'truck' is the definition.
(I've seen this before)
'don't stop waving to a' is the wordplay.
I cannot quite see how this works, but
'stop' could be 'go' (going is a kind of stopping) and 'go' is found in the answer.
'a' could be 'an' and 'an' is present in the remaining letters.
A single letter 'w' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for wagon that I've seen before include "Transport" , "Trailer, railway truck" , "Four-wheeled goods vehicle" , "Vehicle carrying goods" , "Cart; rail truck" .)