Is a mild concoction, though not handy (7)
I believe the answer is:
mislaid
'not handy' is the definition.
I can't judge whether this definition defines the answer.
'is a mild concoction' is the wordplay.
'concoction' indicates an anagram.
'is'+'a'+'mild'='isamild'
'isamild' with letters rearranged gives 'MISLAID'.
'though' acts as a link.
Can you help me to learn more?
(Other definitions for mislaid that I've seen before include "Temporarily lost" , "not to be found?" .)