Got worse again (8)
I believe the answer is:
relapsed
'got worse again' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for relapsed that I've seen before include "Returned to former state, of illness or wicked ways" , "Failed to maintain improvement" , "Fell back (into sickness)" , "Suffered setback" , "Regressed, got worse" .)