... the sky / "Que _, _" (lyric in a song sung by Doris Day) (4)

Ross

I believe the answer is:

sera

(Other definitions for sera that I've seen before include "Hospital supplies" , "Sear with serums" , "Bodily fluids (following 'que'?)" , "Watery liquids" .)

I've seen this clue in The Washington Post.

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