Cryptic crossword clue
Overrating gin, I stirred up a tonic 14

The most common and most likely answer to this crossword clue is the 14 letter word REINVIGORATING

I've seen this crossword clue in The Sunday Telegraph
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Buddy explains!

The straight part
We know that "a tonic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a tonic = reinvigorating.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

Crossword Answer definitions

REINVIGORATING verb
  1. To give new life, energy or strength to someone or something; to revitalize

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