To pull a lever back can be fun (5)
I believe the answer is:
revel
'back can be fun' is the definition.
I can't tell whether this defines the answer.
'to pull a lever' is the wordplay.
'to pull' indicates an anagram (I've seen 'pulling' mean this).
'lever' anagrammed gives 'REVEL'.
Can you help me to learn more?
(Other definitions for revel that I've seen before include "Carouse" , "Paint the town red" , "Be festive, have a good time" , "Have noisy fun" , "Take great delight (in)" .)