The most common and most likely answer to this crossword clue is the 5 letter word CAROL
I've seen this crossword clue in Independent
C
A
R
O
L
More clues leading to the result CAROL
- Hymn about Jesus almost over?
- Song of Republican over in California
- Girl in song at Christmas?
- Roughly cut what actor has to sing
- Vehicle on end of tail – waits may give you this
- Coach old lecturer to sing
- Leaders of choral association regularly oversee lyrics in song
- Song about character kicking drug
- Conservative with a capacity to ignore conclusion? Thatcher, perhaps
- Motor lubricant but not one for a girl
Buddy explains!

The straight part
We know that "Song" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case song = carol.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 CAROL mean?
CAROL noun- A small closet or enclosure built against a window on the inner side, to sit in for study.
- Hence, a partially partitioned space for studying or reading, often in a library.