Caffeinated drink livens setter (5)
I believe the answer is:
pepsi
'caffeinated drink livens setter' is the definition.
I can't tell whether this definition defines the answer.
'livens setter' is the wordplay.
'livens' becomes 'peps' (I can't justify this - if you can you should believe this answer much more).
'setter' becomes 'I' (the person who set this crossword).
'peps'+'i'='PEPSI'
Can you help me to learn more?
(Another definition for pepsi that I've seen is " drink".)
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