Batman's partner runs over trash can (5)
I believe the answer is:
robin
'batman's partner' is the definition.
(I've seen this in another clue)
'runs over trash can' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'over' becomes 'o' (cricket abbreviation).
'trash can' becomes 'bin' (I've seen this in another clue).
'r'+'o'+'bin'='ROBIN'
(Other definitions for robin that I've seen before include "Popular British bird" , "Batman and --" , "Batman's helper" , "good fellow in the D [DREAM]" , "Friendly winter bird" .)