Call to use metric in recycling centre (9)

I believe the answer is:

scrapyard

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'recycling centre' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for scrapyard that I've seen before include "Metal recycling site" , "Steptoes' place" , "Place for metal refuse" , "recycling centre" , "Place for metal waste" .)

I've seen this clue in The Guardian.

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