Lane around Kent introduces rule for slow mover (5)
I believe the answer is:
loris
'introduces rule for slow mover' is the definition.
I can't judge whether this defines the answer.
'lane around kent' is the wordplay.
'lane' becomes 'Lois' (Lois Lane from Superman).
'around' is an insertion indicator.
'kent' becomes 'r' (I can't explain this - if you can you should believe this answer much more).
'lois' placed around 'r' is 'LORIS'.
Can you help me to learn more?
(Other definitions for loris that I've seen before include "Small nocturnal primate" , "Nocturnal primate of Southeast Asia (usually slender or slow)" , "lemur" , "Short-tailed mammal" , "Slow-moving nocturnal primate" .)