Unnecessary hope expressed for someone tired and drunk (5,5)
I believe the answer is:
sleep tight
'unnecessary hope expressed for someone' is the definition.
I don't know anything about this answer so I cannot tell whether this works.
'tired and drunk' is the wordplay.
'tired' becomes 'sleep' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'and' means one lot of letters go next to another.
'drunk' becomes 'tight' (slang term).
'sleep'+'tight'='SLEEP TIGHT'
Can you help me to learn more?
(Other definitions for sleep tight that I've seen before include "Get a good night's rest" , "I wish you a restful night" .)