Attractive means of getting a drink, more or less (6,4)
I believe the answer is:
pretty well
'more or less' is the definition.
(I've seen this before)
'attractive means of getting a drink' is the wordplay.
'attractive' becomes 'pretty' (I've seen this before).
'means of getting a drink' becomes 'well' (as in a well of water).
'pretty'+'well'='PRETTY WELL'
(Other definitions for pretty well that I've seen before include "Sort of" , "Close to" , "More or less" , "Practically" , "Aim of dressing in Derbyshire" .)