The most common and most likely answer to this crossword clue is the 5 plus 3 letter word SMALL FRY
I've seen this crossword clue in The Daily Telegraph
S
M
A
L
L
F
R
Y
More clues leading to the result SMALL FRY
- Slender cook with fat children
- Trivial as whitebait?
- Youngsters getting minimal eggs and bacon?
- Young son and cook going round arcade
- Humiliated dramatist’s young children
- People of little importance for school of the future?
- Army falls out without head of army? Nothing significant
- Children’s items of personal laundry almost burn
Buddy explains!

The straight part
We know that "Youngsters" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case youngsters = small fry.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.
Crossword Answer definitions
SMALL FRY noun- One or more small or immature fish.
- One or more children.
- One or more persons or things of relatively little consequence, importance, or value.