Grandma impatient for fabric (7)

I believe the answer is:

nankeen

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'fabric' is the definition.
(nankeen is a kind of fabric)

'grandma impatient' is the wordplay.
'grandma' becomes 'nan' (I've seen this before).
'impatient' becomes 'keen' (I am not sure about this - if you are sure you should believe this answer much more).
'nan'+'keen'='NANKEEN'

'for' is the link.

Can you help me to learn more?

(Other definitions for nankeen that I've seen before include "Chinese cotton cloth" , "Durable yellow cotton fabric, originally from China" , "Buff-coloured cotton cloth" , "trouser material" , "Buff colour(ed cloth)" .)

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