The most common and most likely answer to this crossword clue is the 8 letter word PEACOCKS
I've seen this crossword clue in The Times
P
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More clues leading to the result PEACOCKS
Buddy explains!
The straight part
We know that "fancy birds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fancy birds = peacocks.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 PEACOCKS mean?
PEACOCKS noun- A male peafowl, especially Pavo cristatus, notable for its brilliant iridescently ocellated tail.
- A peafowl (of the genus Pavo or Afropavo), either male or female.
- A vainglorious person .
- Any of various Asian species of papilionid butterflies of the genus Papilio.