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At his core, smug lyricist produces harmony (5)

Ross

I believe the answer is:

music

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'harmony' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for music that I've seen before include "Organised sound" , "(Pleasant) sequence of sounds" , "'If ... be the food of love, play on'(Twelfth Night)" , "Aural entertainment" , "'''If ... be the food of love, play on'' (Twelfth Night) (5)'" .)

I've seen this clue in The Irish Times.
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