Good cast will accept a cut (6)
I believe the answer is:
gashed
'cut' is the definition.
('gashed' can be a synonym of 'cut')
'good cast will accept a' is the wordplay.
'good' becomes 'g' (abbreviation).
'cast' becomes 'shed' (shedding is a kind of casting**).
'will accept' means one lot of letters goes inside another.
'g'+'shed'='gshed'
'gshed' going around 'a' is 'GASHED'.
(Other definitions for gashed that I've seen before include "Deeply cut" , "Cut open" , "Wounded" .)