Crossword Genius

Poor harmony is leading issue in disco music (10)

Ross

I believe the answer is:

dissonance

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

'poor harmony' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'is leading issue in disco music' is the wordplay.
'leading' is a charade indicator (letters next to each other).
'issue' becomes 'son' (issue can mean someone's offspring).
'in' is an insertion indicator.
'disco music' becomes 'dance' (I can't justify this - if you can you should give a lot more credence to this answer).
'is'+'son'='isson'
'isson' going inside 'dance' is 'DISSONANCE'.

Can you help me to learn more?

(Other definitions for dissonance that I've seen before include "sounds harsh" , "Discordance" , "quartet?" , "Lack of harmony" , "Harsh sound" .)

I've seen this clue in The Sunday Times.
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