Extremely elitist singer, one making an impression (6)
I believe the answer is:
etcher
'one making an impression' is the definition.
(person who creates an impression in something)
'extremely elitist singer' is the wordplay.
'extremely' says to hollow out the word (remove centre letters) (only the extremes of the word are used).
'singer' becomes 'cher' (Cher is a US musician).
'elitist' with its middle removed is 'et'.
'et'+'cher'='ETCHER'
(Other definitions for etcher that I've seen before include "Engraver" , "one who uses acid" , "Cutter" , "One makes a deep impression" , "Maybe she makes engravings" .)