Keep going - or don't! (4)
I believe the answer is:
stay
'keep going' is the definition.
(thesaurus)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for stay that I've seen before include "Corset strut" , "Temporary residence" , "Supporting rope; remain" , "Remain; brace" , "Abide" .)