Plant and tall grass hiding primates (8)
I believe the answer is:
rapeseed
'plant' is the definition.
The answer is an example.
'tall grass hiding primates' is the wordplay.
'tall grass' becomes 'reed' (I've seen this before).
'hiding' is an insertion indicator.
'primates' becomes 'apes' (ape is a kind of primate).
'reed' placed around 'apes' is 'RAPESEED'.
'and' acts as a link.
(Other definitions for rapeseed that I've seen before include "Source of cooking oil" , "Oil producer" , "Part of plant yielding oil" , "Oil-rich crop" .)