The most common and most likely answer to this crossword clue is the 12 letter word MULTITASKING
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Buddy explains!
The straight part
We know that "with several balls in the air?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with several balls in the air? = multitasking.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
MULTITASKING verb- To schedule and execute multiple tasks (program) simultaneously; control being passed from one to the other using interrupts.
- (of a person) To handle multiple tasks at once.
- The simultaneous execution of multiple tasks (programs) under the control of an interrupt-driven operating system.
- (buzzword) The practice or capability of handling more than one task at the same time.