Creature from sewer (3)
I believe the answer is:
ewe
'creature' is the definition.
(female sheep)
'from sewer' is the wordplay.
'from' indicates a hidden word.
'EWE' is hidden within 'sewer'.
(Other definitions for ewe that I've seen before include "Lamb's dam" , "Female animal" , "She'll provide material to knit" , "Palindrome for a female sheep" , "Language" .)