Notes may be blown out of it (4)
I believe the answer is:
oboe
'notes may' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'blown out of it' is the wordplay.
'blown out of' becomes 'obo' (I can't explain this - if you can you should give a lot more credence to this answer).
'it' becomes 'e' ('e' can mean 'electronic' which is similar to 'IT').
'obo'+'e'='OBOE'
'be' is the link.
Can you help me to learn more?
(Other definitions for oboe that I've seen before include "source of notes" , "Orchestral piece" , "Instrument used in 1d" , "Cor anglais in its family" , "Double-reed woodwind" .)