A horsy frame (5)

I believe the answer is:

airer

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'frame' is the definition.
(frame on which clothes are aired)

I cannot understand how the rest of the clue works.

(Other definitions for airer that I've seen before include "Where to dry what's washed" , "What launderers may use" , "Clothes-horse" , "Clothes drier" , "Dryer" .)

I've seen this clue in the Evening Standard.

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