One’s first in library, possibly securing edition? On the contrary (5,4)
I believe the answer is:
early bird
'one's first' is the definition.
(an early bird does something first)
'library possibly securing edition? on the contrary' is the wordplay.
I cannot really see how this works, but
an anagram of 'library' is 'arlybir' which is present in the answer.
'edition?' could be 'ed' and 'ed' is located in the leftover letters.
No letters remain.
This may be the basis of clue (or it may be nonsense).
'in' acts as a link.
(Other definitions for early bird that I've seen before include "one up at dawn" , "arriving in good time?" , "This one catches the worm" , "One who rises before others" , "Vermicidal" .)