Crossword Genius

Dry as duck swallowing energy drink (8)

Ross

I believe the answer is:

teetotal

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'dry' is the definition.
(synonyms)

I don't understand the remainder of the clue.

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(Other definitions for teetotal that I've seen before include "Pledged to abstain from alcohol" , "Non-drinking" , "Abstaining completely from alcohol" , "not taking a drop" , "Avoiding alcohol" .)

I've seen this clue in The Sun.
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