Crossword Genius

Will a drink from this give you courage? (6)

Ross

I believe the answer is:

bottle

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'courage?' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

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(Other definitions for bottle that I've seen before include "Nerve (sl.)" , "Pitcher perhaps" , "It keeps drink" , "cool" , "Container for liquids" .)

I've seen this clue in The Telegraph.
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