Ordering changes, not rigs (7)

I believe the answer is:

sorting

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'ordering' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'changes not rigs' is the wordplay.
'changes' indicates an anagram.
'not'+'rigs'='notrigs'
'notrigs' is an anagram of 'SORTING'.

Can you help me to learn more?

(Other definitions for sorting that I've seen before include "Grouping by class" , "Arranging in groups" , "Classifying" .)

I've seen this clue in The Mirror.

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