Granny seems eager to get buff-coloured fabric (7)
I believe the answer is:
nankeen
'fabric' is the definition.
(nankeen is a kind of fabric)
'granny seems eager to get buff-coloured' is the wordplay.
I cannot quite see how this works, but
'granny' could be 'nan' and 'nan' is found in the answer.
'eager' could be 'keen' (I've seen this before) and 'keen' is located in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nankeen that I've seen before include "Chinese cotton cloth" , "Buff-coloured cotton fabric" , "Buff colour(ed cloth)" , "Buff-coloured cotton cloth" , "trouser material" .)