The most common and most likely answer to this crossword clue is the 7 letter word ANGELIC
I've seen this crossword clue in The Times
A
N
G
E
L
I
C
More clues leading to the result ANGELIC
- ‘Innocent’ Alice being false – no good inside
- Description of awfully nice gal?
- Innocent Ealing comedy’s number one for broadcasting
- Lovely lass into funk, not piano
- Strangely genial Conservative is exceptionally kind
- Sweet, posh lass detained in a jail briefly
- Pure English penned by member of church — only the first article appears
- A new set in charge? That's divine
- Heavenly upper-class girl, one in middle of dance
- Virtuous person funding play since regulars dropped out
Buddy explains!

The straight part
We know that "Sweet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sweet = angelic.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 ANGELIC mean?
ANGELIC adjective- Belonging to, or proceeding from, angels; resembling, characteristic of, or partaking of the nature of, an angel.
- Very sweet-natured or well-behaved.
- Of or pertaining to angelic acid.
- A regular Hausdorff space is said to be angelic if the closure of each relatively countably compact set A is compact and the closure consists of the limits of sequences in A.