Crossword Genius

Has it sun only once a week? (3)

Ross

I believe the answer is:

day

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'week?' is the definition.
(thesaurus)

I can't explain the rest of the clue.

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(Other definitions for day that I've seen before include "Particular date" , "Period of time" , "Doris -, US actress" , "Born yesterday" , "Lewis as poet" .)

I've seen this clue in the Evening Standard.
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