Order me a gross of the finest texture (8)

I believe the answer is:

gossamer

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'the finest texture' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'order me a gross' is the wordplay.
'order' indicates an anagram.
'me'+'a'+'gross'='meagross'
'meagross' is an anagram of 'GOSSAMER'.

'of' acts as a link.

Can you help me to learn more?

(Other definitions for gossamer that I've seen before include "Filmy floating cobweb" , "fine material" , "Some rags (anag.)" , "Really fine stuff" , "Fabric like spider's web" .)

I've seen this clue in the Evening Standard.

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