Cryptic crossword clue
Bairn’s lament with principal interrupting first period? 8

The most common and most likely answer to this crossword clue is the 8 letter word MENARCHE

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Buddy explains!

The straight part
We know that "first period" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case first period = menarche.
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 MENARCHE mean?

MENARCHE noun
  1. The onset of menstruation; a girl's first period.

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