Grandma quick to produce material (7)
I believe the answer is:
nankeen
'material' is the definition.
(nankeen is a type of material)
'grandma quick' is the wordplay.
'grandma' becomes 'nan' (nan can informally mean a grandmother).
'quick' 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 "Chinese cotton cloth" , "Durable yellow cotton fabric, originally from China" , "hard-wearing stuff" , "trouser material" , "Yellowish cotton cloth" .)