Bloomer youth plans to remedy (10)
I believe the answer is:
polyanthus
'bloomer' is the definition.
(I've seen this before)
'youth plans to remedy' is the wordplay.
'to remedy' is an anagram indicator (the letters must be fixed or remedied).
'youth'+'plans'='youthplans'
'youthplans' with letters rearranged gives 'POLYANTHUS'.
(Other definitions for polyanthus that I've seen before include "plant" , "Bloomer" .)