It’s excluded from part of elevenses in his plant (8)
I believe the answer is:
hibiscus
This could be a double definition.
'it's excluded from part of elevenses in his' is the first definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'plant' is the second definition.
The answer is an example.
Can you help me to learn more?
(Other definitions for hibiscus that I've seen before include "Largely tropical flower" , "Genus of mostly tropical plants" , "The rose mallow" , "Large colourful flower" , "Malaysian national symbol" .)