Abundant amusement in vacant shed Kitty used for nefarious purposes (5,4)
I believe the answer is:
slush fund
'kitty used for nefarious purposes' is the definition.
I can't judge whether this definition defines the answer.
'abundant amusement in vacant shed' is the wordplay.
'abundant' becomes 'lush' (similar in meaning).
'amusement' becomes 'fun' (I've seen this before).
'in' means one lot of letters goes inside another.
'vacant' says to hollow out the word (remove centre letters) (a vacant or emptied out form of the word).
'shed' with its centre taken out is 'sd'.
'lush'+'fun'='lushfun'
'lushfun' going into 'sd' is 'SLUSH FUND'.
Can you help me to learn more?
(Other definitions for slush fund that I've seen before include "Sum of money to be used for bribery" , "Questionable political capital" , "Money to be used for financing corruption" , "Reserve of money used for bribery" .)