Crossword Genius

Spells that might help crack the long clues (7)

Ross

I believe the answer is:

periods

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

'spells' is the definition.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for periods that I've seen before include "Stops" , "School lessons" .)

I've seen this clue in The Irish Times.
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