Exotic ivies'll add rash (3-7)
I believe the answer is:
ill-advised
'rash' is the definition.
(I've seen this before)
'exotic ivies'll add' is the wordplay.
'exotic' indicates anagramming the letters (an unusual form of the letters).
'iviesll'+'add'='ivieslladd'
'ivieslladd' with letters rearranged gives 'ILL-ADVISED'.
(Other definitions for ill-advised that I've seen before include "Unwise" , "Imprudent" , "Not prudent" , "Rash" .)