Dream about packing a gun (5)
I believe the answer is:
armed
'packing a gun' is the definition.
'armed' can be an answer for 'packing' (both can mean carrying a weapon). I am not certain of the 'a gun' bit.
'dream about' is the wordplay.
'about' indicates anagramming the letters.
'dream' is an anagram of 'ARMED'.
Can you help me to learn more?
(Other definitions for armed that I've seen before include "Being equipped with 25 Across" , "Prepared for attack" , "Dream about carrying weapons" , "Carrying a weapon" , "Provided with weapons" .)