Discuss idle site to be repurposed after decentralisation, and related matters (4,6)

I believe the answer is:

side issues

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'discuss idle site to be repurposed after decentralisation and related' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'matters' is the wordplay.
I cannot quite see how this works, but
'matters' could be 'issues' ('issue' can be a synonym of 'matter') and 'issues' is found within the answer.
The remaining letters 'side' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

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