Raid, inroad (5)
I believe the answer is:
foray
I believe this clue is a double definition.
'raid' is the first definition.
(I know that raid can be written as foray)
'inroad' is the second definition.
(I've seen this in another clue)
(Other definitions for foray that I've seen before include "Sortie" , "Brief incursion" , "Depredation" , "Brief attack" , "Raid into enemy territory" .)