Sydney beach bum screening weaponry (3,3,5)
I believe the answer is:
bow and arrow
'weaponry' is the definition.
(bow and arrow is a kind of weaponry)
'sydney beach bum screening' is the wordplay.
'sydney beach' becomes 'wanda' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'bum' becomes 'borrow' (I've seen this in another clue).
'screening' indicates putting letters inside (inserted letters are covered or screened by others).
'wanda' inserted into 'borrow' is 'BOW AND ARROW'.
Can you help me to learn more?
(Other definitions for bow and arrow that I've seen before include "Primitive weapon" , "Weapons" , "old weapon" .)