To get a drink out of a hotel, complain! (5)
I believe the answer is:
whine
'complain' is the definition.
(I know that whine is a more specific form of complain)
'to get a drink out of a hotel' is the wordplay.
'to get a drink' becomes 'wine' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'out of' indicates putting letters inside (some letters on the outside of others).
'a hotel' becomes 'h' (phonetic alphabet).
'wine' going around 'h' is 'WHINE'.
Can you help me to learn more?
(Other definitions for whine that I've seen before include "Complain petulantly" , "Moan" , "Complain peevishly" , "Nagging complaint" , "carp" .)