Don't get up to pose with drunk (3,5)
I believe the answer is:
sit tight
'don't get up' is the definition.
I can't tell whether this defines the answer.
'pose with drunk' is the wordplay.
'pose' becomes 'sit' (sitting is a kind of posing).
'with' means one lot of letters go next to another.
'drunk' becomes 'tight' (I've seen this in other clues**).
'sit'+'tight'='SIT TIGHT'
'to' is the link.
Can you help me to learn more?
(Other definitions for sit tight that I've seen before include "Keep one's position" , "Maintain one's seat" , "Wait and see!" , "Don't move" , "Remain firmly in one's place" .)