Basic story may be expressed in a score (8)

I believe the answer is:

scenario

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

'basic story' is the definition.
'scenario' can be an answer for 'story' (thesaurus). I am not certain of the 'basic' bit.

'be expressed in a score' is the wordplay.
'in a score' anagrams to 'SCENARIO'.
But, I am unsure how the anagram is indicated.

'may' is the link.

Can you help me to learn more?

(Other definitions for scenario that I've seen before include "Envisaged situation" , "Film plot outline" , "Iron case (anag)" , "Production plan" , "Written outline of a film, novel, or stage work" .)

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

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