Things are so difficult if you're drunk! (5)
I believe the answer is:
tight
'drunk' is the definition.
(slang term)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for tight that I've seen before include "corked?" , "Miserly (informal) - drunk (informal)" , "Sozzled; mean" , "Strictly imposed; drunk" , "reluctant to buy a round?" .)