The most common and most likely answer to this crossword clue is the 5 letter word DOVES
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More clues leading to the result DOVES
Buddy explains!

The straight part
We know that "Birds" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case birds = doves.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 DOVES mean?
DOVES noun- A pigeon, especially one smaller in size; a bird (often arbitrarily called either a pigeon or a dove or both) of more than 300 species of the family Columbidae.
- A person favouring conciliation and negotiation rather than conflict.
- Term of endearment for one regarded as pure and gentle.
- A greyish, bluish, pinkish colour like that of the bird.