Extra digit inhibiting Pole (2,5)

I believe the answer is:

to spare

'extra' is the definition.
(I've seen this in another clue)

'digit inhibiting pole' is the wordplay.
'digit' becomes 'toe' (digit on a foot).
'inhibiting' is an insertion indicator.
'pole' becomes 'spar' (spar is a kind of pole).
'toe' going around 'spar' is 'TO SPARE'.

(Another definition for to spare that I've seen is " Left over".)

I've seen this clue in The Times.

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