Apart, separately (5)
I believe the answer is:
aside
I believe this clue is a double definition.
'apart' is the first definition.
(I know that apart can be written as aside)
'separately' is the second definition.
(I've seen this before)
(Other definitions for aside that I've seen before include "Remark not for hearing" , "Actor's remark for the audience alone" , "Where one's taken for intimacy" , "kept in reserve" , "Quiet words spoken" .)