9 across
Strength
from
dog
shaking
off
lead
(5)
Strength from dog shaking off lead (5)
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The definition is at the beginning of the clue.
How the clue works
Right, so strength is your definition there — an ASSET being a valuable resource. For the wordplay, take the dog BASSET and shake off its lead, meaning drop the first letter, and you're left with ASSET.