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Action
completely
adopting
inverted
interior
design
(9)
Action completely adopting inverted interior design (9)
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The definition is at the beginning of the clue.
How the clue works
Right, so Action at the start is your definition — a procedure, a course of action. Now take PURE, meaning completely, and get it to "adopt" (i.e. wrap around) DECOR, which is your interior design bit, but reversed as the clue says "inverted" — flip DECOR and you get ROCED. Slot that inside PURE and you're left with PROCEDURE.