24 across
Arrest
in
general
location
reversed
(6)
Arrest in general location reversed (6)
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The definition is at the beginning of the clue.
How the clue works
"Arrest" is your definition, as in to collar someone. For the wordplay, dive into "general location" and you'll spot RALLOC sitting there hidden inside — read that backwards, as "reversed" instructs, and it spells out COLLAR.