Graph paper pattern (4)
I believe the answer is:
grid
'graph paper pattern' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for grid that I've seen before include "Network of spaced lines" , "Network of intersecting lines" , "F1 starting point" , "Grating - which you are filling in" , "this 15x15 space?" .)