Puts a new coat on: The material, satin, is unusual? (8)
I believe the answer is:
repaints
'puts a new coat' is the definition.
I can't tell whether this defines the answer.
'on the material satin is unusual?' is the wordplay.
'on' indicates putting letters inside (as in clothing 'on' a person).
'the material' becomes 'rep' (rep is a kind of material).
'is unusual?' indicates an anagram.
'satin' is an anagram of 'aints'.
'rep' placed inside 'aints' is 'REPAINTS'.
Can you help me to learn more?
(Other definitions for repaints that I've seen before include "Applies colour again" , "Coats again" .)