Perhaps Brownie pack arrived with artillery (3,6)
I believe the answer is:
box camera
'perhaps brownie' is the definition.
I can't tell whether this definition defines the answer.
'pack arrived with artillery' is the wordplay.
'pack' becomes 'box' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'arrived' becomes 'came' (come can mean to appear or arrive).
'with' says to put letters next to each other.
'artillery' becomes 'RA' (Royal Artillery).
'box'+'came'+'ra'='BOX CAMERA'
Can you help me to learn more?
(Other definitions for box camera that I've seen before include "One took pictures" , "One taking shots" , "Simple shooter" , "one taking pictures" , "Old-fashioned photo taker" .)