Nullify the effect of scattered cinders (7)

I believe the answer is:

rescind

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

'nullify the effect' is the definition.
'rescind' can be an answer for 'nullify' (thesaurus). I'm not certain of the 'the effect' bit.

'scattered cinders' is the wordplay.
'scattered' indicates an anagram.
'cinders' anagrammed gives 'RESCIND'.

'of' is the link.

Can you help me to learn more?

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

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