A personal matter 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 personal matter' is the wordplay.
'personal matter' becomes 'tissue' (tissue is a kind of matter. I am not sure about the 'personal' bit.).
'a'+'tissue'='AT ISSUE'

Can you help me to learn more?

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

I've seen this clue in The Sunday Times and The Times.

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