The most common and most likely answer to this crossword clue is the 7 letter word MOUSSES
I've seen this crossword clue in The Guardian
M
O
U
S
S
E
S
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 = mousses.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 MOUSSES mean?
MOUSSES noun- An airy pudding served chilled, particularly chocolate mousse.
- A savory dish, of meat or seafood, containing gelatin.
- A styling cream used for hair.
- A stable emulsion of water and oil that is created by wave action churning the water where an oil spill occurs.
- To apply mousse (styling cream).