Stately booze up? (5)
I believe the answer is:
regal
'stately' is the definition.
(thesaurus)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for regal that I've seen before include "Royal - 5 down (anag)" , "Like a queen?" , "fit for the Queen" , "Befitting a monarch" , "Grand and imposing" .)