The most common and most likely answer to this crossword clue is the 5 plus 5 letter word SALAD CREAM
I've seen this crossword clue in Financial Times
S
A
L
A
D
C
R
E
A
M
More clues leading to the result SALAD CREAM
- Laugh about a young man dressing
- Dressing a boy in top for Sunday best
- Daughter unfortunately knocked over lotion, dressing
- Adam clears out – leaves with this on?
- Shriek, coming across a young man dressing
- Something very amusing about a young male dressing
- Dressing that’s 50% slimming and 50% definitely not!
- Dressing a boy in Sunday best
- Howl catching a young man dressing
- Something funny about a boy — saucy thing
Buddy explains!

The straight part
We know that "Dressing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dressing = salad cream.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.