Wool-maker hides in sewer (3)

I believe the answer is:

ewe

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'wool-maker hides' is the definition.
I can't judge whether this definition defines the answer.

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

Can you help me to learn more?

(Other definitions for ewe that I've seen before include "21a [SHEEP]" , "Wool supplier" , "Female ovine" , "Lamb's dam" , "Wool producer" .)

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

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