Crossword Genius

Disheartened guitar artisan eating seconds to be heartier (7)

Ross

I believe the answer is:

lustier

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

'heartier' is the definition.
('lusty' can be a synonym of 'hearty')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for lustier that I've seen is " More red-blooded".)

I've seen this clue in the Sydney Morning Herald.
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