Crossword Genius

A Mrs Green ordering a duck (9)

Ross

I believe the answer is:

merganser

'a duck' is the definition.
(I know that merganser is a type of sea duck)

'a mrs green ordering' is the wordplay.
'ordering' is an anagram indicator.
'a'+'mrs'+'green'='amrsgreen'
'amrsgreen' with letters rearranged gives 'MERGANSER'.

(Other definitions for merganser that I've seen before include "Together saw bill" , "Diving bird" , "Diver" , "Diving duck" , "Sawbill" .)

I've seen this clue in the Evening Standard.
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