Crossword Genius

At heart envisions playful, amazing style - prefiguring, maybe, a linear arrangement (6)

Ross

I believe the answer is:

syzygy

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'at' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for syzygy that I've seen before include "couple" , "Eclipse condition" , "Conjunction or opposition" , "appearance of new moon" , "line-up of stars, perhaps" .)

I've seen this clue in The Independent.
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