The most common and most likely answer to this crossword clue is the 8 letter word ULULATED
I've seen this crossword clue in The Times
U
L
U
L
A
T
E
D
More clues leading to the result ULULATED
Buddy explains!

The straight part
We know that "howled in grief" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case howled in grief = ululated.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 ULULATED mean?
ULULATED verb- To howl loudly or prolongedly in lamentation or joy
- To produce a rapid and prolonged series of sharp noises with one's voice.