Just starting maybe you really treasure lovely evergreen shrub (6)
I believe the answer is:
myrtle
'shrub' is the definition.
(myrtle is a kind of shrub)
'just starting maybe you really treasure lovely evergreen' is the wordplay.
'just starting' says to take the initial letters.
The first letters of 'maybe you really treasure lovely evergreen' is 'MYRTLE'.
(Other definitions for myrtle that I've seen before include "Shrub with purple-black oval berries" , "Try Mel for the flowering shrub" , "Fragrant evergreen shrub" , "Shrub with white flowers and aromatic berries" , "Shiny evergreen shrub" .)