Cryptic crossword clue
Offensive tunes found on children’s transport 9

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

I've seen this crossword clue in The Guardian
A
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Buddy explains!

The straight part
We know that "Offensive" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case offensive = airstrike.
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 AIRSTRIKE mean?

AIRSTRIKE noun
  1. An attack on a ground or naval target by one or more aircraft or missiles.
AIRSTRIKE verb
  1. To attack a ground target through the use of aircraft or missiles.

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