Gotham sidekick runs over trash can (5)
I believe the answer is:
robin
'gotham sidekick' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'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'
Can you help me to learn more?
(Other definitions for robin that I've seen before include "Hood, possibly" , "See 12" , "Friendly winter bird" , "Small brown thrush" , "Bird - one in Lincoln green?" .)