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Monarch
formerly
eating
fish
and
duck
(5)
Monarch formerly eating fish and duck (5)
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The definition is at the end of the clue.
How the clue works
The definition is duck, referring to the eider sea duck. "Monarch formerly" gives ER (the late Queen, Elizabeth Regina) which "eating" the fish IDE wraps around it, splitting into E + IDE + R to make EIDER.