Reading can provide endless pleasure (7)
I believe the answer is:
perusal
'reading' is the definition.
(I know that perusal is a type of reading)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for perusal that I've seen before include "Reading, examination" , "Thorough reading" , "A casual read or study" , "Thorough read-through" , "Study or scrutiny" .)