Garden visitor runs over trash can (5)
I believe the answer is:
robin
'garden visitor' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the 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 "Batman's helper" , "Red and brown songbird" , "Seasonal bird" , "Bird, killed by Sparrow" , "Batman and --" .)