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Company
actor
initially
wearing
plain
attire
(8)
Company actor initially wearing plain attire (8)
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The definition is at the end of the clue.
How the clue works
Right, so attire at the end is what we're defining - something you'd wear. For the wordplay, take OVERT (meaning plain) and stuff CO (that's company) plus A (just the initial letter of actor) inside it, and you get OVER-CO-A-T slotted together to build the whole thing.