Don’t budge, being too drunk to stand up? (3,5)
I believe the answer is:
sit tight
'don't budge' is the definition.
(to sit tight is to not move)
'too drunk to stand up?' is the wordplay.
I cannot really understand how this works, but
'drunk' could be 'tight' (I've seen this before) and 'tight' is located in the answer.
The remaining letters 'sit' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'being' acts as a link.
(Other definitions for sit tight that I've seen before include "Maintain one's seat" , "Keep one's position" , "Wait and see!" , "Go nowhere" , "Informally, remain sedentary, don't act" .)