This foray ruined shrub (9)
I believe the answer is:
forsythia
'shrub' is the definition.
(forsythia is a kind of shrub)
'this foray ruined' is the wordplay.
'ruined' is an anagram indicator.
'this'+'foray'='thisforay'
'thisforay' is an anagram of 'FORSYTHIA'.
(Other definitions for forsythia that I've seen before include "Say a frosty hi to the early blooming shrub with bright yellow flowers" , "A frosty hi to the flowering shrub" , "Bush" , "Ornamental shrub" , "bloomer in spring" .)