Cryptic crossword clue
Scotch is a no-no for Rugby School’s leader 5,2,3,4

The most common and most likely answer to this crossword clue is the 8 plus 8 letter word KNOCK ON THE HEAD

I've seen this crossword clue in The Guardian
K
N
O
C
K
Â
 
O
N
T
H
E
Â
 
H
E
A
D

Buddy explains!

The straight part
We know that "Scotch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scotch = knock on the head.
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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