Not standing for a session (7)
I believe the answer is:
sitting
I believe this is a double definition.
'not standing' is the first definition.
('sit' is the opposite to 'stand')
'session' is the second definition.
(I know that session can be written as sitting)
'for a' is the link.
(Other definitions for sitting that I've seen before include "Well placed" , "such an easy target" , "Being portrayed" , "Session of spiritualists or court" , "On a seat" .)