One who loves to get in the sack? (9)
I believe the answer is:
oenophile
'loves to get in the sack?' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'one' is the wordplay.
I cannot really see how this works, but
an anagram of 'one' is 'oen' which is within the answer.
This explanation may well be incorrect...
'who' is the link.
Can you help me to learn more?
(Other definitions for oenophile that I've seen before include "Connoisseur of wine" , "Lover of wine" , "Wine-lover" , "Wine buff" , "Drink lover" .)