Hi! I undo trash on an escaper (7)
I believe the answer is:
houdini
'on an escaper' is the definition.
The definition suggests a singular noun which matches the answer.
'hi i undo trash' is the wordplay.
'trash' is an anagram indicator.
'hi'+'i'+'undo'='hiiundo'
'hiiundo' anagrammed gives 'HOUDINI'.
Can you help me to learn more?
(Other definitions for houdini that I've seen before include "Harry -, US escapologist" , "American escapologist, d. 1926" , "Harry was famous as an escape artist" , "one who'd try to escape?" , "being given to escapism?" .)