Have a discussion about one kind of tree (7)
I believe the answer is:
conifer
'tree' is the definition.
(I know that conifer is a type of gymnospermous tree)
'have a discussion about one kind' is the wordplay.
I cannot really understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is present in the answer.
'one' could be 'i' (Roman numeral) and 'i' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'of' acts as a link.
Can you help me to learn more?
(Other definitions for conifer that I've seen before include "Fir or pine, for example" , "In force (anag.)" , "Fir or larch, for example" , "E.g. yew, pine or fir" , "The tree keeps its leaves" .)