21 across
Black
cat
chases
ball
catching
6
in
limbo
(8)
Black cat chases ball catching 6 in limbo (8)
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The definition is at the end of the clue.
How the clue works
So limbo is your definition — that forgotten, suspended state. The wordplay chains together O for a ball, B for black, and LION for cat, but before you stick LION on the end you shove VI (that's 6 in Roman numerals) inside it to get LI-VI-ON, giving you the whole thing.