Is it paste produced in this plant? (8)
I believe the answer is:
shamrock
'this plant?' is the definition.
(shamrock is a kind of plant)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for shamrock that I've seen before include "Clover native to Ireland" , "Symbol of Ireland" , "Native Irish trefoil" , "Ireland's special trefoil" , "Pressed grape-juice" .)