Classic toy with the jingle lyric "a spring, a spring, a marvelous thing!" (6)

Ross

I believe the answer is:

slinky

(Other definitions for slinky that I've seen before include "Clinging" , "Lean" , "Sinuous and sexy" , "Sinuously graceful" , "Slim and seductive - furtive" .)

I've seen this clue in The New York Times.

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