Cryptic crossword clue
Unexpected ending in ‘Londonderry Air’, London music hall song 3,3,4

The most common and most likely answer to this crossword clue is the 3 plus 3 plus 4 letter word ANY OLD IRON

I've seen this crossword clue in The Daily Telegraph
A
N
Y
O
L
D
I
R
O
N

Buddy explains!

The straight part
We know that "music hall song" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case music hall song = any old iron.
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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