View of edible plant entertaining private investigator (7)
I believe the answer is:
opinion
'view' is the definition.
(I know that view can be written as opinion)
'edible plant entertaining private investigator' is the wordplay.
'edible plant' becomes 'onion' (I can't justify this - if you can you should believe this answer much more).
'entertaining' means one lot of letters goes inside another (inviting in, as for dinner).
'private investigator' becomes 'PI' (abbreviation).
'onion' enclosing 'pi' is 'OPINION'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for opinion that I've seen before include "View held without positive proof" , "A view held as probable - well, that's mine" , "Unproven belief" , "'Judgment, view (7)'" , "View, barrister's advice" .)