Wooden strip traditionally used to support plasterwork (4)

I believe the answer is:

lath

(Other definitions for lath that I've seen before include "Narrow strip of wood as used in trellis" , "Thin wood strip supporting plaster" , "Strip of wood, backing for plaster say" , "Plaster-supporting wood strip" , "Wooden strip for plaster" .)

I've seen this clue in The Guardian.

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