Coat with this material is not commonly worn on impulse at the front (8,5)
I believe the answer is:
emulsion paint
'coat with this material' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'not commonly worn on impulse at the front' is the wordplay.
'not commonly' becomes 'aint' (I've seen this in other clues).
'worn' is an anagram indicator (worn can mean damaged).
'at the front' says to put letters next to each other (some letters go in front of others).
'on'+'impulse'='onimpulse'
'onimpulse' with letters rearranged gives 'emulsionp'.
'aint' put after 'emulsionp' is 'EMULSION PAINT'.
'is' is the link.
Can you help me to learn more?
(Other definitions for emulsion paint that I've seen before include "Wall-covering perhaps" , "Type of wall covering" .)