The most common and most likely answer to this crossword clue is the 6 letter word COOING
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More clues leading to the result COOING
Buddy explains!
The straight part
We know that "Sound of pigeon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sound of pigeon = cooing.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 COOING mean?
COOING verb- To make a soft murmuring sound, as a pigeon.
- To speak in an admiring fashion, to be enthusiastic about.
- A coo; a cooing sound.