Pinching when drunk (5)
I believe the answer is:
tight
I believe this is a double definition.
'pinching' is the first definition.
(thesaurus)
'drunk' is the second definition.
(I've seen this before)
'when' acts as a link.
(Other definitions for tight that I've seen before include "Snug" , "Stingy; drunk" , "lack of money" , "Stretched" , "with limited room to manoeuvre" .)