Girl’s mini-poem? (6)
I believe the answer is:
odette
'girl's' is the definition.
'mini-poem?' is the wordplay.
I cannot quite see how this works, but
'poem?' could be 'ode' (ode is a kind of poem) and 'ode' is found in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for odette that I've seen before include "Lover of Swann" , "Part of Swan Lake" , "1950 film about first female to receive George Cross" , "Swan Lake role" , "------ Churchill, French war heroine" .)