Break partly cures this (4)
I believe the answer is:
rest
'break' is the definition.
(a rest is taking a break)
'partly cures this' is the wordplay.
'partly' indicates the answer is hidden within the clue (part of the clue is used).
'REST' is hidden within 'cures this'.
(Other definitions for rest that I've seen before include "Inactivity" , "Support for putting things on" , "Leisure" , "Others; cease work" , "'Relax, pause from work (4)'" .)