Crude old carpet’s acquired, useful to cover study (5-3-5)

I believe the answer is:

rough-and-ready

(Other definitions for rough-and-ready that I've seen before include "Crude - unpolished" , "Unrefined" , "Lacking refinement but serving a purpose" , "Easily improvised" , "Serving well enough for the task" .)

I've seen this clue in The Times.

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