Cryptic crossword clue
Youngster’s tucked into cake and salad as a working rule 10,3

The most common and most likely answer to this crossword clue is the 11 plus 3 letter word PARKINSON’S LAW

I've seen this crossword clue in The Guardian
P
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K
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€
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W

Buddy explains!

The straight part
We know that "working rule" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case working rule = parkinson’s law.
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.

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