Crossword Genius

Who called Danny Boy? (5)

Ross

I believe the answer is:

pipes

I'm a little stuck... Click here to teach me more about this clue!

'who' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'called danny boy?' is the wordplay.
I cannot really see how this works, but
'boy?' could be 'pip' and 'pip' is found in the answer.
The remaining letters 'es' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for pipes that I've seen before include "Hollow tubes" , "Long tubes" , "Scots instrument" , "Transmits" , "Hollow cylindrical shapes" .)

I've seen this clue in The Sun.
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