A rambler right and left (5)
I believe the answer is:
rover
'a rambler' is the definition.
(I've seen this before)
'right and left' is the wordplay.
'right' becomes 'r' (common abbreviation).
'and' is a charade indicator (letters next to each other).
'left' becomes 'over' (I've seen this before).
'r'+'over'='ROVER'
(Other definitions for rover that I've seen before include "One who wanders about" , "Person who wanders - a good name for dog" , "Vehicle driven remotely over extraterrestrial terrain" , "gypsy" , "Person given to wandering" .)