Thick paint applied to map is getting damaged (7)
I believe the answer is:
impasto
'thick paint' is the definition.
'impasto' can be an answer for 'paint' (impasto is a type of paint). I am not sure about the 'thick' bit.
'applied to map is getting damaged' is the wordplay.
'applied' is an anagram indicator (apply the letters).
'getting damaged' becomes 'to' (I can't justify this - if you can you should believe this answer much more).
'map'+'is'='mapis'
'mapis' anagrammed gives 'impas'.
'impas'+'to'='IMPASTO'
Can you help me to learn more?
(Other definitions for impasto that I've seen before include "Sort of paint" , "Thick painting technique" , "Slapping paint on" , "artist's application" , "Thick coat required" .)