Attack with no raid organised (6)
I believe the answer is:
inroad
'attack' is the definition.
(I know that inroad is a type of invasion)
'with no raid organised' is the wordplay.
'with' means one lot of letters go next to another.
'organised' is an anagram indicator.
'no' put next to 'raid' is 'noraid'.
'noraid' anagrammed gives 'INROAD'.
(Other definitions for inroad that I've seen before include "Foray" , "One's intrusive" , "Sudden attack made into a country" , "Encroachment, intrusion" , "Ordain (anag.)" .)