In twelve roses you'll find symbol of love (4)
I believe the answer is:
eros
'symbol of love' is the definition.
(I've seen this in another clue)
'in twelve roses you'll' is the wordplay.
'in' indicates the answer is hidden within the clue.
'EROS' can be found hidden inside 'twelve roses youll'.
'find' is the link.
(Other definitions for eros that I've seen before include "Arrow-shooting god" , "Sore about love god" , "Form of love" , "London landmark" , "Circus boy" .)