Do, re or mi (4)
I believe the answer is:
note
'do re or mi' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for note that I've seen before include "Crotchet or minim, say?" , "Jotting" , "Pay attention to; record" , "Observe the musical pitch." , "Some money - some music" .)