Woolgrower trapped in sewer (3)
I believe the answer is:
ewe
'woolgrower' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
'trapped in sewer' is the wordplay.
'trapped in' indicates the answer is hidden within the clue.
'EWE' can be found hidden inside 'sewer'.
Can you help me to learn more?
(Other definitions for ewe that I've seen before include "Scottish loch" , "Lamb's mother" , "Female in a fleece?" , "Ruminant" , "A palindromic sheep" .)