Leave, in order to get drink (7)
I believe the answer is:
forsake
'leave in order' is the definition.
'forsake' can be an answer for 'leave' (thesaurus). I am unsure of the 'in order' bit.
'to get drink' is the wordplay.
'to get' becomes 'for' (eg 'work to get cash' means 'work for cash').
'drink' becomes 'sake' (sake is a kind of drink).
'for'+'sake'='FORSAKE'
Can you help me to learn more?
(Other definitions for forsake that I've seen before include "Abondon or renounce" , "Leave in the lurch" , "'Abandon, desert (7)'" , "Give up" .)