Crossword Genius

Switched sides on LP - presumably that's what DJ might have done? (7,3'1,4) (7,4,4)

Ross

I believe the answer is:

changed ones tune

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'lp presumably that's what dj might have done? 73'14' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'switched sides on' is the wordplay.
I cannot really understand how this works, but
'switched' could be 'changed' ('change' can be a synonym of 'switch') and 'changed' is found within the answer.
'on' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Irish Times (Crosaire) and The Irish Times.
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