Crossword Genius

It's heavenly to be dreamy, as if in love (4)

Ross

I believe the answer is:

moon

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

'love' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for moon that I've seen before include "Titan, perhaps" , "down one's pants" , "Expose one's buttocks" , "Heavenly body < exemplified in Titania?" , "Where Armstrong stood" .)

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