Figure heaps out (5)
I believe the answer is:
shape
'figure' is the definition.
('shape' can be a synonym of 'figure')
'heaps out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'heaps' with letters rearranged gives 'SHAPE'.
(Other definitions for shape that I've seen before include "External form" , "Good physical form" , "Heaps (anag.)" , "'Figure, outline (5)'" , "Phase (anag.)" .)