Bats in the MCG, lacking marks for artistic impression (7)
I believe the answer is:
etching
'artistic impression' is the definition.
'etching' can be an answer for 'impression' (I've seen this before). I am not sure about the 'artistic' bit.
'bats in the mcg lacking marks' is the wordplay.
'bats' indicates an anagram (slang for mad).
'lacking' suggests deleting specific letters.
'marks' becomes 'M' (former German currency).
'in'+'the'+'mcg'='inthemcg'
'inthemcg' with 'm' removed is 'inthecg'.
'inthecg' anagrammed gives 'ETCHING'.
'for' is the link.
Can you help me to learn more?
(Other definitions for etching that I've seen before include "Print produced from engraving" , "craftwork" , "Engraved artwork" , "graven image" , "making an impression" .)