A part of a poem is deliberately wicked (8)
I believe the answer is:
perverse
'a poem is deliberately wicked' is the definition.
I can't judge whether this defines the answer.
'a part' is the wordplay.
'a' becomes 'per' (eg 'one a day' means 'one per day').
'part' becomes 'verse' (I have seen 'Part of hymn ' mean 'verse' so perhaps 'part' could also mean 'verse').
'per'+'verse'='PERVERSE'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for perverse that I've seen before include "Preserve in order to be contrary or intractable" , "'Wayward, peevish (8)'" , "It's wrong" , "Deliberately difficult" , "'Unreasonable, awkward (8)'" .)