Swap last pair then middle pair of 3, ringing changes (4)

I believe the answer is:

peal

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'ringing changes' is the definition.
'peal' can be an answer for 'ringing' (thesaurus). I'm not sure about the 'changes' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for peal that I've seen before include "Set of bells for ringing" , "Ring recurrently" , "Leap about to sound of bells" , "Set of church bells" , "Loud burst of thunder - or laughter" .)

I've seen this clue in The Independent.

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