### Clue: At heart envisions playful, amazing style – prefiguring, maybe, a linear arrangement (6)
### Answer: SYZYGY 
 ### Explanation: Definition: a linear arrangement
 **Middle letters, respectively, of**(At heart) "envisions playful, amazing style – prefiguring, maybe".
Defn: … whereby a celestial body, the sun, and the earth lie in a straight line.