Unable to be examined by the surgeon? That’s unlikely (10)

I believe the answer is:

improbable

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'unlikely' is the definition.
('improbable' can be a synonym of 'unlikely')

I can't explain the rest of the clue.

(Other definitions for improbable that I've seen before include "Far-fetched" , "Highly unlikely" , "Not likely" .)

I've seen this clue in the Evening Standard.

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