Disappear, having grabbed right coat (7)
I believe the answer is:
varnish
'coat' is the definition.
(I know that varnish is a type of coat)
'disappear having grabbed right' is the wordplay.
'disappear' becomes 'vanish' (synonyms).
'having grabbed' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'vanish' enclosing 'r' is 'VARNISH'.
(Other definitions for varnish that I've seen before include "Protective coating" , "Hard glossy surface" , "Transparent resin coating" , "It is applied to wood to make it shine" , "Coating for wood, etc" .)