Drinker in curious otherworld (3)
I believe the answer is:
sot
'drinker' is the definition.
(sot is a kind of drinker)
'in curious otherworld' is the wordplay.
'in' says the answer is hidden in the clue.
'SOT' is hidden in the letters of 'curious otherworld'.
(Other definitions for sot that I've seen before include "Boozer" , "One drinks" , "Toper" , "drunk" , "Habitual drunkard" .)