Eve and Abel at odds — do not disturb (5,2)
I believe the answer is:
leave be
'do not disturb' is the definition.
'eve and abel at odds' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'at odds' is an anagram indicator.
'eve' put after 'abel' is 'abeleve'.
'abeleve' is an anagram of 'LEAVE BE'.
(Other definitions for leave be that I've seen before include "Refrain from disturbing (someone)" , "Let remain undisturbed" .)