Raid or incursion (6)
I believe the answer is:
inroad
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">raid</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(inroad can mean a raid or attack)</span><br/ ><br/ >'<span class="explanation-format__original">incursion</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that inroad is a type of invasion)</span><br/ ><br/ ></span>
(Other definitions for inroad that I've seen before include "Encroachment; hostile attack" , "One's intrusive" , "Ordain (anag.)" , "Foray" , "Encroachment, intrusion" .)