Miserly when drunk (5)
I believe the answer is:
tight
I believe this clue is a double definition.
'miserly' is the first definition.
(synonyms)
'drunk' is the second definition.
(slang term)
'when' acts as a link.
(Other definitions for tight that I've seen before include "Miserly (informal) - drunk (informal)" , "Close-fitting; cramped; mean" , "with limited room to manoeuvre" , "Tense; secretive" , "Hard to move; drunk" .)