No surgical procedures? I've slipped up! (4)

I believe the answer is:

oops

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'i've slipped up' is the definition.
I can't judge whether this definition defines the answer.

'no surgical procedures?' is the wordplay.
'no' becomes 'O' (O resembles 0).
'surgical procedures?' becomes 'ops' (op is short for operation).
'o'+'ops'='OOPS'

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(Other definitions for oops that I've seen before include "Apologetic exclamation" , "Exclamation on making minor error" , "Harem" , "Exclamation recognising a mistake has been made" , "Exclamation after mistake or minor accident" .)

I've seen this clue in The Sun.

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