The most common and most likely answer to this crossword clue is the 13 letter word GET-UP-AND-GO
I've seen this crossword clue in Financial Times
G
E
T
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U
P
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A
N
D
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G
O
More clues leading to the result GET-UP-AND-GO
- Energy wasted upon gadget
- Leave drive
- The Right Stuff and Top Gun aged badly
- Outfit with attempt to convey ‘pizazz’
- Leave before breakfast and dash
- Dress, a number worn by broadcasting executive showing dynamism
- Ganged up to repair drive
- Fire outfit with old German first
- Outfit with attempt to convey 'pizazz'
- Vim in clothing an unusual dog
Buddy explains!

The straight part
We know that "Vim" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case vim = get-up-and-go.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 GET-UP-AND-GO mean?
GET-UP-AND-GO noun- Enthusiastic and energetic drive or ambition