Cryptic crossword clue
Alumnus and soldiers kept late after school That’s compulsory! 9

The most common and most likely answer to this crossword clue is the 9 letter word OBLIGATED

I've seen this crossword clue in Financial Times
O
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Buddy explains!

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.

What does OBLIGATED mean?

OBLIGATED verb
  1. To bind, compel, constrain, or oblige by a social, legal, or moral tie.
  2. To cause to be grateful or indebted; to oblige.
  3. To commit (money, for example) in order to fulfill an obligation.
OBLIGATED adjective
  1. Committed
  2. Having an obligation; obliged

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