Crossword Genius

Celebratory music describing monarchs with horrible droning (8,4)

Ross

I believe the answer is:

drinking song

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

'celebratory music' is the definition.

'monarchs with horrible droning' is the wordplay.
I cannot really understand how this works, but
'monarchs' could be 'kings' (king is a kind of monarch) and 'kings' is present in the answer.
an anagram of 'droning' is 'drinong' which is within the remaining letters.
No letters remain.
This explanation may well be incorrect...

'describing' acts as a link.

Can you help me to learn more?

I've seen this clue in The Everyman puzzle in The Observer.
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