"Ah, that's right!"

YESYES

Think of a double affirmation you might say when finally remembering something obvious.

The clue ""Ah, that's right!"" mimics the sound of someone nodding in agreement, like saying "yes, yes" to confirm they remember or understand. The answer "YESYES" simply repeats the word "yes" to match that back-and-forth affirmation. It’s a straightforward sound-alike hint where the spoken phrase becomes the written answer.