Crossword Genius

Strange charm that is pure fantasy (7)

Ross

I believe the answer is:

chimera

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'fantasy' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for chimera that I've seen before include "Mythological animal; something illusory" , "Imaginary monster" , "Illusory achievement; mythical beast" , "Fire-breathing female monster" , "Mythical creature; delusion" .)

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