Crossword Genius

Innocent girl rendered unseeing but for that second (7)

Ross

I believe the answer is:

ingenue

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'innocent girl' is the definition.

I don't understand the remainder of the clue.

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(Other definitions for ingenue that I've seen before include "she's not spotted" , "Naive young actress" , "Naive young woman" , "Genuine sort of young actress" , "young woman lacking experience" .)

I've seen this clue in the Sydney Morning Herald.
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