Go on the wagon, traditionally (4)
I believe the answer is:
trek
'go' is the definition.
(thesaurus)
'on the wagon traditionally' is the wordplay.
I cannot really see how this works, but
'on' could be 're' ('on' can be mean 'with reference to') and 're' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
A single letter 'k' 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 trek that I've seen before include "Difficult journey on foot" , "A long hard march" , "Long difficult walk" , "A long arduous march" , "Footslog" .)