The most common and most likely answer to this crossword clue is the 4 letter word TOFF
I've seen this crossword clue in The Guardian
T
O
F
F
More clues leading to the result TOFF
- Swell time away from work
- Swell, reaching a high volume
- Swell until at great volume
- Upper-class type is mostly sweet
- Swell to fortissimo
- Characterised by force in motion
- Swell until very loud
- No proletarian has time away from work
- A good sort having time away
- Endless confectionery after departure of European aristocrat, perhaps
Buddy explains!

The straight part
We know that "Upper-class type" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case upper-class type = toff.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 TOFF mean?
TOFF noun- An elegantly dressed person.
- A person of the upper class, or with pretensions to it, who usually communicates an air of superiority.