Crossword Genius

Angel cake primarily eaten by its creator? (6)

Ross

I believe the answer is:

backer

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

'angel' is the definition.
(angel can mean a financial backer)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for backer that I've seen before include "Patron or supporter" , "Financial supporter" , "'Supporter, usually provides finance (6)'" , "A supporter or a betting man" , "Person supporting another financially" .)

I've seen this clue in The Sun.
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