Peanut, say, does lie around (7)
I believe the answer is:
oilseed
'peanut' is the definition.
The answer and definition can be both plants as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'does lie around' is the wordplay.
'around' is an anagram indicator.
'does'+'lie'='doeslie'
'doeslie' is an anagram of 'OILSEED'.
'say' is the link.
Can you help me to learn more?
(Other definitions for oilseed that I've seen before include "grain" , "Description of rape" , "The product of plants such as rape" , "something for the press?" , "Source of lubricant" .)