The most common and most likely answer to this crossword clue is the 6 letter word COOING
I've seen this crossword clue in The Daily Telegraph
C
O
O
I
N
G
More clues leading to the result COOING
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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.