Fruit of a noted oil-yielding plant (5)
I believe the answer is:
grape
'fruit' is the definition.
(grape is a kind of fruit)
'noted oil-yielding plant' is the wordplay.
'noted' becomes 'g' (I can't justify this - if you can you should believe this answer much more).
'oil-yielding plant' becomes 'rape' (I've seen this before).
'g'+'rape'='GRAPE'
'of a' is the link.
Can you help me to learn more?
(Other definitions for grape that I've seen before include "Vine berry" , "Wine fruit" , "In Elgin rummage about in the dark" , "Small fruit; type of shot" , "Pager (anag.)" .)