Confusing her with my poem (5)
I believe the answer is:
rhyme
'poem' is the definition.
(I know that rhyme is a type of poem)
'confusing her with my' is the wordplay.
'confusing' indicates an anagram.
'with' is a charade indicator (letters next to each other).
'her' put after 'my' is 'myher'.
'myher' with letters rearranged gives 'RHYME'.
(Other definitions for rhyme that I've seen before include "Piece of poetry" , "Poem, eg for nursery" , "Have the same final sound - poetry" , "Box and cox, for example" , "Word for bird" .)