The most common and most likely answer to this crossword clue is the 4 plus 10 letter word LATA MANGESHKAR
L
A
T
A
M
A
N
G
E
S
H
K
A
R
Buddy explains!
The straight part
We know that "She sang" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case she sang = lata mangeshkar.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.