Areas for discussion about large section of Life on Earth (5)
I believe the answer is:
flora
'section of life on earth' is the definition.
The answer and definition can be both groups as well as being singular nouns.
Maybe there's a link between them I don't understand?
'areas for discussion about large' is the wordplay.
'areas for discussion' becomes 'fora' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'large' becomes 'L' (eg in clothes sizes).
'fora' going around 'l' is 'FLORA'.
Can you help me to learn more?
(Other definitions for flora that I've seen before include "list of plants" , "list of plant life" , "local plants" , "Plant life (to go with fauna)" , "Plant life of particular area" .)