Crossword Genius

One sending brainy message in bottle? (5)

Ross

I believe the answer is:

nerve

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'bottle?' is the definition.
(both can mean courage)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nerve that I've seen before include "Strand of body fibre" , "Impulse transmitter - bottle" , "Impudence (colloq.)" , "Boldness" , "Body fibre conveying sensations to brain" .)

I've seen this clue in The Sun.
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