Cross put in ground, by order (9)
I believe the answer is:
intersect
'cross' is the definition.
('intersect' can be a synonym of 'cross')
'put in ground by order' is the wordplay.
'put in ground' becomes 'inter' (I've seen this in other clues).
'by' means one lot of letters go next to another.
'order' becomes 'sect' (I've seen this in other clues**).
'inter'+'sect'='INTERSECT'
(Other definitions for intersect that I've seen before include "Cut across" , "Divide into parts" , "making one cross" , "Meet at a point" , "Criss-cross" .)