Fitting rhyme for "spa” (3)

I believe the answer is:

aah

(Other definitions for aah that I've seen before include "Expression of appreciation or amazement" , "regular partner of 3 [OOH]" , "Expression of surprise" .)

I've seen this clue in the King Feature Syndicate.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.