Product of the flax plant (7)
I believe the answer is:
linseed
'product of the flax plant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for linseed that I've seen before include "Flax product, a source of oil" , "Type of oil" , "Oil applied to cricket bats" , "Flax plant product providing oil" , "Oil producer" .)