Chart shape (3)
I believe the answer is:
pie
'chart shape' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pie that I've seen before include "In the sky, this dish is impractical" , "Small, former Indian coin" , "Filled pastry" , "Bird - dish - mixed type" , "Very easy answer as" .)