A point of view expressed in stage whisper (5)
I believe the answer is:
aside
'stage whisper' is the definition.
(both can mean a remark heard by an audience)
'a point of view' is the wordplay.
'point of view' becomes 'side' (I've seen this in another clue).
'a'+'side'='ASIDE'
'expressed in' is the link.
(Other definitions for aside that I've seen before include "Remark by an actor, directly to audience say" , "Separately" , "Out of other people's hearing" , "Line spoken to the audience of a play" , "Digression" .)