In real tennis, the sloping buttress on one side of the receiver's end of the court (7)

I believe the answer is:

tambour

(Other definitions for tambour that I've seen before include "Beat this" , "Circular frame to hold fabric tight for embroidery" , "flexible desktop" , "construction of sewers" , "circle for 13 [NEEDLEWORK]" .)

I've seen this clue in The Mirror.

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