A gauzy fabric under discussion (2,5)

I believe the answer is:

at issue

'under discussion' is the definition.
(I've seen this before)

'a gauzy fabric' is the wordplay.
'gauzy fabric' becomes 'tissue' (I've seen this before).
'a'+'tissue'='AT ISSUE'

(Other definitions for at issue that I've seen before include "Questionable" , "in dispute" , "Being discussed or disputed" , "under debate" , "In question, under discussion" .)

I've seen this clue in The Telegraph.

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