Record the same note twice - it's sharp (4)
I believe the answer is:
epee
'sharp' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'record the same note twice' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'the same note' becomes 'e' (musical note. I am not sure about the 'same' bit.).
'twice' shows that letters should be duplicated.
'e' duplicated is 'ee'.
'ep'+'ee'='EPEE'
'it's' is the link.
Can you help me to learn more?
(Other definitions for epee that I've seen before include "Fencing blade" , "Sharp-pointed duelling sword" , "Use it to fence" , "Duelling blade" , "sports equipment" .)