Feature of most crosswords (8)
I believe the answer is:
symmetry
'feature of most crosswords' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for symmetry that I've seen before include "Due proportion" , "shapely attribute" , "Pleasing proportion between parts of a whole" , "Regularity of shape" , "Mirrored disposition about axis" .)