It's awful, getting drunk – don't move (3,5)
I believe the answer is:
sit tight
'don't move' is the definition.
(I've seen this before)
'it's awful getting drunk' is the wordplay.
'awful' indicates an anagram.
'getting' says to put letters next to each other.
'drunk' becomes 'tight' (slang term).
'its' anagrammed gives 'sit'.
'sit'+'tight'='SIT TIGHT'
(Other definitions for sit tight that I've seen before include "Informally, remain sedentary, don't act" , "Don't move" , "Keep one's position" , "Wait and see!" , "Go nowhere" .)