Wanderer runs by (5)
I believe the answer is:
rover
'wanderer' is the definition.
(I know that wanderer can be written as rover)
'runs by' is the wordplay.
'runs' becomes 'r' (cricket abbreviation).
'by' becomes 'over' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'r'+'over'='ROVER'
Can you help me to learn more?
(Other definitions for rover that I've seen before include "gypsy" , "one in Bristol, one in Doncaster, perhaps" , "Wanderer, archery mark" , "Car - dog" , "Wanderer, rolling stone" .)