Crossword Genius

Gull aloft, spreading delicate wings (4)

Ross

I believe the answer is:

dupe

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'gull' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dupe that I've seen before include "Hoodwink, fool" , "Cheat" , "Person who is deceived or tricked" , "Hoodwink, deceive" , "Fool or hoax" .)

I've seen this clue in the Sydney Morning Herald.
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