Cryptic crossword clue
Plan whiskey during vigil, fully alert 4-5

The most common and most likely answer to this crossword clue is the 10 letter word WIDE-AWAKE

I've seen this crossword clue in The Times
W
I
D
E
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A
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A
K
E

Buddy explains!

The straight part
We know that "fully alert" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fully alert = wide-awake.
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.

What does WIDE-AWAKE mean?

WIDE-AWAKE adjective
  1. Completely or fully awake
  2. Alert, vigilant or watchful
WIDE-AWAKE noun
  1. A bird, the sooty tern.
  2. A type of hat with a broad brim made of black or brown felt.

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