Note microphones used by impressionists (6)
I believe the answer is:
mimics
'impressionists' is the definition.
(I've seen this in another clue)
'note microphones used by' is the wordplay.
'note' becomes 'mi' (musical note).
'microphones' becomes 'mics' (I can't justify this - if you can you should believe this answer much more).
'used by' means one lot of letters go next to another.
'mi'+'mics'='MIMICS'
Can you help me to learn more?
(Other definitions for mimics that I've seen before include "Imitates for satirical effect" , "Impersonates or parrots" , "Imitators" , "Imitates satirically" , "Copies - apes" .)