Plant hangers designed with petals (8,5)
I believe the answer is:
elephant grass
'plant' is the definition.
(type of plant)
'hangers designed with petals' is the wordplay.
'designed with' is an anagram indicator (designed with the letters).
'hangers' mixed up with 'petals' can make 'ELEPHANT GRASS'.
(Other definitions for elephant grass that I've seen before include "source of paper" , "tall plant" , "crop in Africa" , "plain diet" .)