Banished U2 guitarist from stage. Relieved! (4,3,4,3)

I believe the answer is:

took the edge off

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'stage relieved' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'banished u2 guitarist from' is the wordplay.
'banished' becomes 'took' (I can't explain this - if you can you should give a lot more credence to this answer).
'uo guitarist' becomes 'theedge' (I've seen this in another clue).
'from' becomes 'off' (eg someone might be from or 'off' a TV show).
'took'+'theedge'+'off'='TOOK THE EDGE OFF'

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I've seen this clue in the Sydney Morning Herald.

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