A disposable item under discussion (2,5)

I believe the answer is:

at issue

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

'a disposable item' is the wordplay.
'disposable item' 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'

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

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