Under discussion (2,5)

I think it could be either:

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2,5

at issue

'under discussion' is the definition.
(at issue means currently being discussed)

This is the entire clue.

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

I've seen this clue in The Mirror and The Independent.

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