The most common and most likely answer to this crossword clue is the 7 letter word TOFFEES
I've seen this crossword clue in The Daily Telegraph
T
O
F
F
E
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 = toffees.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 TOFFEES mean?
TOFFEES noun- A type of confectionery made by boiling sugar (or treacle, etc) with butter or milk, then cooling the mixture so that it becomes hard
- A small, individual piece of toffee
- Any kind of sweets; candy
- To coat in toffee.