Temporary relief about ill-will (7)
I believe the answer is:
respite
'temporary relief' is the definition.
(I've seen this before)
'about ill-will' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'ill will' becomes 'spite' (I've seen this in another clue).
're'+'spite'='RESPITE'
(Other definitions for respite that I've seen before include "interruption" , "See trip (anag.)" , "Break from doing something" , "Brief period of rest" , "Pause from pain" .)