Alone, without company (8)
I believe the answer is:
solitary
This clue is a double definition.
'alone' is the first definition.
(synonyms)
'without company' is the second definition.
(I've seen this before)
(Other definitions for solitary that I've seen before include "Without company" , "Being the only one" , "Alone, single" , "Confinement" , "Lone; isolated" .)