Crossword Genius

Alert, notes noose loose (2,4,4)

Ross

I believe the answer is:

on ones toes

'alert' is the definition.
(I've seen this before)

'notes noose loose' is the wordplay.
'loose' indicates anagramming the letters (letters are loosened from their original positions).
'notes'+'noose'='notesnoose'
'notesnoose' anagrammed gives 'ON ONES TOES'.

(Other definitions for on ones toes that I've seen before include "ready" , "Alert; where the interfering tread" .)

I've seen this clue in The Telegraph.
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