One who stops? Just the opposite (6)
I believe the answer is:
stayer
'one who stops?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'the opposite' is the wordplay.
I cannot quite see how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
The remaining letters 'sayer' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'just' is the link.
Can you help me to learn more?
(Other definitions for stayer that I've seen before include "tenacious sort" , "Horse with stamina" , "One likely to carry on" , "Horse with endurance" , "Person who lasts the course, doesn't quit" .)