Control plant, securing rebirth (13)
I believe the answer is:
reincarnation
'rebirth' is the definition.
(synonyms)
'control plant' is the wordplay.
'control' becomes 'rein' (synonyms).
'plant' becomes 'carnation' (carnation is a flower).
'rein'+'carnation'='REINCARNATION'
'securing' is the link.
(Other definitions for reincarnation that I've seen before include "new life" , "Soul's rebirth in another body" , "Rebirth (of a soul)" , "revised version" , "Embodiment of a soul in a new form after death" .)