__ as a peacock (vain) (5)

I believe the answer is:

proud

(Other definitions for proud that I've seen before include "Self-satisfied - arrogant" , "Guilty of deadly sin" , "Feeling self-respect - projecting from a surface" , "Haughty - sticking out" , "Walking tall" .)

I've seen this clue in the Newsday and the Newsday.com.

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