The most common and most likely answer to this crossword clue is the 7 letter word HUMBUGS
I've seen this crossword clue in The Daily Telegraph
H
U
M
B
U
G
S
More clues leading to the result HUMBUGS
Buddy explains!

The straight part
We know that "Sweets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sweets = humbugs.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 HUMBUGS mean?
HUMBUGS noun- A hoax, jest, or prank.
- A fraud or sham (countable); hypocrisy (uncountable).
- A fraudster, cheat, or hypocrite.
- Nonsense.
- A type of hard sweet (candy), usually peppermint flavoured with a striped pattern.
- Anything complicated, offensive, troublesome, unpleasant or worrying; a misunderstanding, especially if trivial.
- (African American Vernacular) A fight.
- (African American Vernacular) A gang.
- A false arrest on trumped-up charges.
- (Perhaps by extension) The piglet of the wild boar.
- To play a trick on someone, to cheat, to swindle, to deceive.
- (African American Vernacular) To fight; to act tough.
- To waste time talking.