We linger outside nevertheless (7)
I believe the answer is:
however
'nevertheless' is the definition.
(I know that nevertheless can be written as however)
'we linger outside' is the wordplay.
'linger' becomes 'hover' (synonyms).
'outside' means one lot of letters goes inside another.
'we' going inside 'hover' is 'HOWEVER'.
(Other definitions for however that I've seen before include "In whatever way" , "Nonetheless" , "Though" , "Nevertheless" , "Yet" .)