Strip of old wall? (4)

I believe the answer is:

lath

(Other definitions for lath that I've seen before include "A thin strip of wood as for making furniture" , "Halt bearing strip of wood" , "Narrow strip of wood used as backing for plasterwork" , "Strip of wood used with plaster" , "Narrow thin strip of wood" .)

I've seen this clue in The Guardian.

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