Discover a bit of stuff in dustbin (4)
I believe the answer is:
find
'discover' is the definition.
(I know that attain is a kind of find)
'a bit of stuff in dustbin' is the wordplay.
'a bit of' indicates the answer is hidden within the clue.
'FIND' can be found hidden inside 'stuff in dustbin'.
(Other definitions for find that I've seen before include "Acquisition" , "Track down" , "Discovery" , "Encounter, locate" , "Realise" .)