Daughter has drinks in one! (5)
I believe the answer is:
downs
'drinks in one' is the definition.
(I've seen this before)
'daughter has' is the wordplay.
'daughter' becomes 'd'.
'has' becomes 'owns' ('own' can be a synonym of 'have').
'd'+'owns'='DOWNS'
(Other definitions for downs that I've seen before include "Drinks in one" , "S. England chalk hills" , "Gently rolling hills" , "Southern uplands" , "Naturally part of SE England" .)