Playing Uno with Kathy? You shouldn’t have! (5,3)
I believe the answer is:
thank you
'shouldn't have' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'playing uno with kathy?' is the wordplay.
'playing' indicates anagramming the letters.
'with' says to put letters next to each other.
'uno'+'kathy'='unokathy'
'unokathy' anagrammed gives 'THANK-YOU'.
'you' is the link.
Can you help me to learn more?
(Other definitions for thank you that I've seen before include "Ta" , "Much obliged!" , "Conventional expression of gratitude" , "Polite acknowledgment" , "Cheers" .)