Big duck finally making eggs smoother (9)

I believe the answer is:

goosander

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'big duck' is the definition.
'goosander' can be an answer for 'duck' (I've seen this before). I am not certain of the 'big' bit.

'finally making eggs smoother' is the wordplay.
'finally' suggests the final letters.
'eggs' becomes 'oo' (visually resembles two eggs).
'smoother' becomes 'sander' (something which sands or smooths objects).
The last letter of 'making' is 'g'.
'g'+'oo'+'sander'='GOOSANDER'

Can you help me to learn more?

(Other definitions for goosander that I've seen before include "Waterbird" , "duck" , "Bird" .)

I've seen this clue in The Independent.

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