Means to arrange ambush (6)
I believe the answer is:
waylay
'ambush' is the definition.
('waylay' can be a synonym of 'ambush')
'means to arrange' is the wordplay.
'means' becomes 'way' ('way' can be a synonym of 'means'**).
'to arrange' becomes 'lay' (I've seen this before).
'way'+'lay'='WAYLAY'
(Other definitions for waylay that I've seen before include "Intercept and attack" , "Ambush - detain in talk" , "Lie in wait for, to talk or rob (6)" , "Lie in wait for and ambush" , "Intercept and detain" .)