Eye surgery more costly when complicated (10)

I believe the answer is:

sclerotomy

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'eye surgery' is the definition.
The definition suggests a singular noun which matches the answer.

'more costly when complicated' is the wordplay.
'when complicated' is an anagram indicator (a complex or confusing ordering of the letters).
'more'+'costly'='morecostly'
'morecostly' anagrammed gives 'SCLEROTOMY'.

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I've seen this clue in The Telegraph.

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