Wounds receding care of plaster (6)
I believe the answer is:
stucco
'plaster' is the definition.
(stucco is a kind of plaster)
'wounds receding care of' is the wordplay.
'wounds' becomes 'cuts' (cut is a kind of wound).
'receding' says the letters should be written in reverse.
'care of' becomes 'co' (c/o can mean 'care of' when addressing mail).
'cuts' reversed gives 'stuc'.
'stuc'+'co'='STUCCO'
(Other definitions for stucco that I've seen before include "wall-covering" , "Fine decorative plaster" , "Mixture for decorative use on buildings" , "Fine plaster for moulding into architectural decorations" , "Plaster used to coat walls" .)