Nevertheless, resent leaving to work in a library (6)
I believe the answer is:
Here is my best explanation:
'in a library' is the definition.
I can't judge whether this defines the answer.
'nevertheless resent leaving to work' is the subsidiary indication.
'leaving' indicates named letters should be taken away.
'to work' indicates anagramming the letters.
'nevertheless' with 'resent' taken out is 'vheles'.
'vheles' is an anagram of 'shelve'.
(Other definitions for shelve that I've seen before include "Put aside for the present, plan or book", "Put on the back burner", "Put aside for later consideration - in cupboard?", "Not now handle", "Defer (a plan or project)", "Put on one side", "Store", "Abandon, defer", "Postpone" and "Place on a horizontal surface".)