Make invalid discern changes (7)

I believe the answer is:

rescind

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'make invalid' is the definition.
Although both the answer and definition are verbs in their base form, I cannot see how one could define the other.

'discern changes' is the wordplay.
'changes' is an anagram indicator.
'discern' with letters rearranged gives 'RESCIND'.

Can you help me to learn more?

(Other definitions for rescind that I've seen before include "Revoke (a law/order)" , "Annul - discern (anag)" , "undo" , "Annul using cinders" , "Countermand" .)

I've seen this clue in The Times.

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