Sick to benefit more? None too soon (3,6,4)
I believe the answer is:
not before time
'none too soon' is the definition.
(I've seen this before)
'sick to benefit more?' is the wordplay.
'sick' is an anagram indicator.
'to'+'benefit'+'more'='tobenefitmore'
'tobenefitmore' anagrammed gives 'NOT BEFORE TIME'.
(Other definitions for not before time that I've seen before include "A bit late" , "None too soon" , "Comment imputing tardiness" , "Rather tardily" .)