The most common and most likely answer to this crossword clue is the 7 letter word YOWLING
I've seen this crossword clue in The Guardian
Y
O
W
L
I
N
G
Buddy explains!

The straight part
We know that "crying loudly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crying loudly = yowling.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 YOWLING mean?
YOWLING verb- Utter a yowl.
- Express by yowling; utter with a yowl.
- A sound that yowls.