Heightened writing style claims mirage is shimmering (5,7)

I believe the answer is:

magic realism

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

'heightened writing style' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'claims mirage is shimmering' is the wordplay.
'is shimmering' is an anagram indicator (letters shimmer or shake around).
'claims'+'mirage'='claimsmirage'
'claimsmirage' is an anagram of 'MAGIC REALISM'.

Can you help me to learn more?

(Other definitions for magic realism that I've seen before include "Literary genre with surreal elements" , "style of art?" .)

I've seen this clue in The Guardian.

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