A digit to note (3)

I believe the answer is:

toe

'a digit' is the definition.
(digit on a foot)

'to note' is the wordplay.
'note' becomes 'e' (musical note).
'to'+'e'='TOE'

(Other definitions for toe that I've seen before include "Conform-...the line" , "Lower end or tip" , "Calabria?" , "compliantly put on line" , "one digit?" .)

I've seen this clue in the Evening Standard.

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