Old lady eager to produce hard-wearing fabric (7)
I believe the answer is:
nankeen
'hard-wearing fabric' is the definition.
(nankeen is a type of fabric)
'old lady eager' is the wordplay.
'old lady' becomes 'nan' (British slang for grandmother).
'eager' becomes 'keen' (I've seen this before).
'nan'+'keen'='NANKEEN'
'to produce' is the link.
(Other definitions for nankeen that I've seen before include "Buff-coloured cotton fabric" , "mustard colour" , "trouser material" , "Hard-wearing fabric, originally from China" , "Buff colour" .)