Sheep trapped by drain (3)

I believe the answer is:

ewe

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'sheep' is the definition.
(a ewe is a female sheep)

I can't explain the rest of the clue.

(Other definitions for ewe that I've seen before include "Female ovine" , "A palindromic sheep" , "Scottish loch" , "Lamb supplier" , "One needing pastoral care" .)

I've seen this clue in The Telegraph.

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