31 across
Cat’s
powerless
to
make
sudden
leap
(5)
Cat’s powerless to make sudden leap (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Cat — specifically an ounce, which is an old word for a snow leopard. Take sudden leap, which gives you POUNCE, then strip out the P (P being the symbol for power in physics, so "powerless" means drop it) and you're left with your answer.