9 across
Appropriate
names
acquired
by
a
partner
in
the
past
(5)
Appropriate names acquired by a partner in the past (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Appropriate, in the sense of seizing or annexing something. You're building the answer from A ("a"), then NN (abbreviation for "names"), then EX (a "partner in the past") — stick them together and there it is.