A camp, out of the way (5)
I believe the answer is:
aside
'out of the way' is the definition.
(synonyms)
'a camp' is the wordplay.
'camp' becomes 'side' (both can mean a group or faction).
'a'+'side'='ASIDE'
(Other definitions for aside that I've seen before include "Remark not for hearing" , "Whispered comment" , "Separately" , "Apart; incidental remark" , "Actor's remark for the audience alone" .)