Six-sided shape (7)
I believe the answer is:
hexagon
'six-sided shape' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for hexagon that I've seen before include "Shape of a honeycomb cell" , "there are several sides to it" , "Six-sided shape" , "A six-sided geometric figure" , "Six-sided polygon" .)