Singer in musical production heartlessly cutting second number (7)
I believe the answer is:
soprano
'singer in musical production' is the definition.
'soprano' can be an answer for 'singer' (soprano is a kind of singer). I am unsure of the 'in musical production' bit.
'heartlessly cutting second number' is the wordplay.
'heartlessly cutting second' becomes 'sopra' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'number' becomes 'no.' (abbreviation for 'number').
'sopra'+'no'='SOPRANO'
Can you help me to learn more?
(Other definitions for soprano that I've seen before include "(Singer of) the highest vocal range" , "Producer of high-pitched sounds" , "Singer who aims high" , "Sutherland?" , "Singer of high notes" .)