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' (vanishing is a kind of disappearing).
'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" .)