You’re kidding frisky flower-maids (5,4,2)
I believe the answer is:
words fail me
'you're kidding' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'frisky flower-maids' is the wordplay.
'frisky' indicates an anagram.
'flower'+'maids'='flowermaids'
'flowermaids' with letters rearranged gives 'WORDS FAIL ME'.
Can you help me to learn more?
(Other definitions for words fail me that I've seen before include "expression of astonishment" , "I don't know what to say!" , "I can't express how I feel" .)