Crossword Genius

First-class material being discussed (2,5)

Ross

I believe the answer is:

at issue

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'being discussed' is the definition.
(I've seen this before)

'first-class material' is the wordplay.
'first' becomes 'a' (first letter of the alphabet).
'class material' becomes 'tissue' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a'+'tissue'='AT ISSUE'

Can you help me to learn more?

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

I've seen this clue in The Daily Express.
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