Dream about having weapons (5)
I believe the answer is:
armed
'having weapons' is the definition.
(I've seen this before)
'dream about' is the wordplay.
'about' is an anagram indicator.
'dream' anagrammed gives 'ARMED'.
(Other definitions for armed that I've seen before include "Tooled up" , "prepared to shoot?" , "ready to fight" , "Equipped with weapons" , "Being equipped with 25 Across" .)