Jumbo, say, may open a real can of worms (9)
I believe the answer is:
aeroplane
'can of worms' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'jumbo say may open a real' is the wordplay.
'jumbo say' becomes 'a' (I can't explain this - if you can you should give a lot more credence to this answer).
'may' indicates an anagram (I've seen 'might' mean this (I've seen this in other clues)).
'open'+'real'='openreal'
'openreal' is an anagram of 'eroplane'.
'a'+'eroplane'='AEROPLANE'
Can you help me to learn more?
(Other definitions for aeroplane that I've seen before include "Fixed-wing aircraft" , "Lancaster?" , "What taxis" , "Spitfire, for example" , "crate?" .)