At last (7)
'at last' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for eventually that I've seen before include "In due course" , "In the fullness of time" , "sooner or later" , "In the end" , "At last" .)
(Other definitions for not before time that I've seen before include "A bit late" , "Rather tardily" , "None too soon" , "Comment imputing tardiness" .)
'at last' is the definition.
(synonyms)
This is all the clue.
(Other definitions for finally that I've seen before include "when all is said and done" , "At last" , "for ever" .)