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Bird dropping left in full-length Disney film on wigeons, initially (9)

Ross

I believe the answer is:

waterfowl

I'm a little stuck... Click here to teach me more about this clue!

'bird' is the definition.
(I know that waterfowl is a type of bird)

'dropping left in full-length disney film on wigeons initially' is the wordplay.
I cannot quite see how this works, but
'left' could be 'l' (common abbreviation) and 'l' is found in the answer.
'length' could be 'r' (r is a kind of length) and 'r' is found within the answer.
'film' could be 'w' (W, film about George W Bush) and 'w' is present in the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for waterfowl that I've seen is " Aquatic game birds".)

I've seen this clue in The Independent.
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