Weapon found in overturned wastepaper basket (5)
I believe the answer is:
sabre
'weapon' is the definition.
(sabre is a kind of weapon)
'in overturned wastepaper basket' is the wordplay.
'overturned' shows that the letters should be reversed in order.
'in' indicates the answer is hidden within the clue.
'erbas' can be found hidden inside 'wastepaper basket'.
'erbas' in reverse letter order is 'SABRE'.
'found' acts as a link.
(Other definitions for sabre that I've seen before include "Large wasp" , "Sword with curved blade" , "Sword (that may be rattled)" , "Type of sword" , "weapon" .)