Python perhaps lethargic (4)
I believe the answer is:
idle
I believe this clue is a double definition.
'python' is the first definition.
(Eric Idle, member of Monty Python)
'lethargic' is the second definition.
(thesaurus)
'perhaps' acts as a link.
(Other definitions for idle that I've seen before include "Trivial" , "Indolent" , "Maybe Eric" , "no longer employed?" , "Tick over like engine" .)