Arid sort of attack (4)
I believe the answer is:
raid
'attack' is the definition.
(I know that raid is a type of incursion)
'arid sort' is the wordplay.
'sort' indicates anagramming the letters.
'arid' is an anagram of 'RAID'.
'of' is the link.
(Other definitions for raid that I've seen before include "Finch and Bronson starred in . . . . On Entebbe" , "Stock Exchange activity" , "Sally" , "Invade" , "Smash-and-grab?" .)