Cryptic crossword clue
Head boy left to squeal: he was out for the count 3,7

The most common and most likely answer to this crossword clue is the 3 plus 7 letter word VAN HELSING

I've seen this crossword clue in The Times
V
A
N
H
E
L
S
I
N
G

Buddy explains!

The straight part
We know that "he was out for the count" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case he was out for the count = van helsing.
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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