Crossword Genius

Daughter avoids open car, day being very hot (7)

Ross

I believe the answer is:

roaster

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'daughter' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for roaster that I've seen before include "A resort (anag.)" , "Oven chicken?" , "hot day" , "cooker" , "Fowl for the oven" .)

I've seen this clue in The Times.
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