Manage some lines in abridged dictionary (7)
I believe the answer is:
oversee
'manage' is the definition.
(I know that manage can be written as oversee)
'some lines in abridged dictionary' is the wordplay.
'some lines' becomes 'verse' (lines of poetry).
'in' is an insertion indicator.
'abridged' means to remove the last letter.
'dictionary' becomes 'OED' (Oxford English Dictionary).
'oed' with its last letter removed is 'oe'.
'verse' put into 'oe' is 'OVERSEE'.
(Other definitions for oversee that I've seen before include "Inspect" , "take charge" , "Supervise, keep an eye on" , "Supervise officially" , "As supervisor does" .)