Crossword Genius

Not a change for the better (7)

Ross

I believe the answer is:

relapse

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'better' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps you can see an association between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for relapse that I've seen before include "Get worse again" , "Fall back into old ways" , "Repeals (anag.)" , "medical problem" , "Become ill again" .)

I've seen this clue in The Guardian and The Globe and Mail.
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