Perceive a way to rescind (7)

I believe the answer is:

discern

I'm a little stuck... Click here to teach me more about this clue!

'perceive' is the definition.
(I've seen this in another clue)

'a way to rescind' is the wordplay.
'rescind' anagrams to 'DISCERN'.
Though, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for discern that I've seen before include "Recognise, find out" , "Make out, distinguish by eye" , "See" , "Pick out" , "Espy" .)

I've seen this clue in the Evening Standard.

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