Bottle perhaps attached to optic? (5)

I believe the answer is:

nerve

I believe this is a double definition.

'bottle' is the first definition.
(thesaurus)

'perhaps attached to optic?' is the second definition.
(optic nerve)

(Other definitions for nerve that I've seen before include "Cool courage" , "Temerity" , "Confidence" , "Sauce" , "Courage - impertinence" .)

I've seen this clue in The Times.

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