Dry as duck swallowing energy drink (8)
I believe the answer is:
teetotal
'dry' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(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" .)