Woolgrower hiding in the sewer (3)

I believe the answer is:

ewe

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'woolgrower hiding' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'in the sewer' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EWE' is hidden within 'sewer'.

Can you help me to learn more?

(Other definitions for ewe that I've seen before include "Sheep found in sewer" , "She'll provide material to knit" , "Partner to ram" , "Ram's partner?" , "21a [SHEEP]" .)

I've seen this clue in the Sydney Morning Herald.

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