Grief getting book for son - maybe get something from the library (6)
I believe the answer is:
borrow
'maybe get something from the library' is the definition.
(eg borrowing a book from the library)
I don't understand how the remainder of the clue works.
(Other definitions for borrow that I've seen before include "Receive as a loan" , "Use for a while and hand back" , "Get the temporary use of, but give back" , "Temporarily adopt" , "Take with (or without!) permission" .)