Out of bed on one side, honest (7)
I believe the answer is:
upright
'honest' is the definition.
(thesaurus)
'out of bed on one side' is the wordplay.
'out of bed' becomes 'up' ('up' can be a synonym of 'out of bed').
'on' says to put letters next to each other.
'one side' becomes 'right' (I've seen this before).
'up'+'right'='UPRIGHT'
(Other definitions for upright that I've seen before include "Honest (like a piano?)" , "support" , "Vertical like rugby goal post" , "not grand" , "Virtuous" .)