Crossword Genius

And coo, look what we’re having to pay! (4)

Ross

I believe the answer is:

bill

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'pay' is the definition.
The answer and definition can be both related to property as well as being singular nouns.
Maybe you can see a link between them that I don't see?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for bill that I've seen before include "American banknote; man's name" , "The fellow" , "Circular - account" , "Promontory; beak" , "Notice - printed advertisement" .)

I've seen this clue in the Evening Standard.
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