Crossword Genius

The danger is extraordinary when longer vision is lacking (11)

Ross

I believe the answer is:

nearsighted

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'longer vision is lacking' is the definition.
I can't tell whether this definition defines the answer.

'the danger is extraordinary' is the wordplay.
'extraordinary' indicates anagramming the letters.
'the'+'danger'+'is'='thedangeris'
'thedangeris' is an anagram of 'NEARSIGHTED'.

'when' is the link.

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I've seen this clue in The Irish Times.
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