Cryptic crossword clue
Aquatic bird, funny-looking alien gull 9

The most common and most likely answer to this crossword clue is the 9 letter word GALLINULE

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Buddy explains!

The straight part
We know that "Aquatic bird" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case aquatic bird = gallinule.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does GALLINULE mean?

GALLINULE noun
  1. A bird of one of several species in the genera Porphyrio and Gallinula of the family Rallidae.

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