The most common and most likely answer to this crossword clue is the 10 letter word SWEETHEART
I've seen this crossword clue in The Guardian
S
W
E
E
T
H
E
A
R
T
More clues leading to the result SWEETHEART
Buddy explains!
The straight part
We know that "darling/Wee" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case darling/wee = sweetheart.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 SWEETHEART mean?
SWEETHEART noun- A person who is always very kind.
- A person very much liked or loved by someone, especially when both partners are young.
- A female member of a college or university fraternity.