The most common and most likely answer to this crossword clue is the 11 letter word SPRIGHTLIER
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More clues leading to the result SPRIGHTLIER
Buddy explains!

The straight part
We know that "more nimble" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more nimble = sprightlier.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 SPRIGHTLIER mean?
SPRIGHTLIER adjective- Animated, gay or vivacious; lively, spirited.
- Of a person: full of life and vigour, especially with a light and springy step.
- Of or relating to a sprite; ghostly, spectral.