Cultivated rose (4)
I believe the answer is:
grew
I believe this clue is a double definition.
'cultivated' is the first definition.
(growing is a kind of cultivating)
'rose' is the second definition.
(I've seen this in another clue)
(Other definitions for grew that I've seen before include "Developed, matured" , "Multiplied" , "Sprouted" , "Increased in size" , "Got bigger" .)