Blooming types of heads on silver maple produced in self-interest (10)

I believe the answer is:

narcissism

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

'self-interest' is the definition.
(narcissism is a kind of self-interest)

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

Can you help me to learn more?

(Other definitions for narcissism that I've seen before include "show great self-interest?" , "Self-absorption" , "Self-obsession" , "Vanity" , "Self-love" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

Want a hint initially instead of a full solution? Install my app