Head gardener drags over nearly all of the dirt, making a criss-cross pattern (4)
I believe the answer is:
grid
'pattern' is the definition.
(I know that grid is a type of pattern)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for grid that I've seen before include "Source of power" , "Electricity network" , "Rectangular framework" , "frame" , "Barred framework" .)