Crossword Genius

Divine grub emergency worker ate right before pop star (8)

Ross

I believe the answer is:

ambrosia

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

'pop star' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for ambrosia that I've seen before include "Beebread" , "meal fit for gods" , "Legendary food bringing immortality" , "Gods' dinner?" , "luxury food" .)

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