Musical performers burn records, heartlessly (7)
I believe the answer is:
singers
'musical performers' is the definition.
'singers' can be an answer for 'performers' (singer is a kind of performer). I am not sure about the 'musical' bit.
'burn records heartlessly' is the wordplay.
'burn' becomes 'singe' (singing is a kind of burning).
'heartlessly' means to remove the middle letters.
'records' with its middle removed is 'rs'.
'singe'+'rs'='SINGERS'
Can you help me to learn more?
(Other definitions for singers that I've seen before include "Choristers" , "Vocalists" , "Chorus" , "See 26" , "Eg, choir members" .)