Vessel taking care of flower (7)
I believe the answer is:
coaster
'vessel' is the definition.
(I've seen this before)
'care of flower' is the wordplay.
'care of' becomes 'co' (c/o can mean 'care of' when addressing mail).
'flower' becomes 'aster' (type of flower).
'co'+'aster'='COASTER'
'taking' acts as a link.
(Other definitions for coaster that I've seen before include "on which some mug may be made to stand?" , "It goes under a schooner, perhaps" , "Mat to protect a table" , "proceeds with little effort" , "Tray; trader" .)