Unceasing, depraved idleness I rejected (7)
I believe the answer is:
endless
'unceasing' is the definition.
(I've seen this before)
'depraved idleness i rejected' is the wordplay.
'depraved' is an anagram indicator.
'rejected' is a deletion indicator.
'idleness' with 'i' taken away is 'dleness'.
'dleness' with letters rearranged gives 'ENDLESS'.
(Other definitions for endless that I've seen before include "Everlasting" , "Infinite, perpetual" , "permanent" , "Going on and on, interminable" , "Unceasing" .)