False information about introduction of mulberry trees (5)
I believe the answer is:
limes
'trees' is the definition.
(lime is a kind of tree)
'false information about introduction of mulberry' is the wordplay.
'false information' becomes 'lies' (I am not sure about this - if you are sure you should believe this answer much more).
'about' is an insertion indicator.
'introduction of' indicates taking the first letters.
The first letter of 'mulberry' is 'm'.
'lies' enclosing 'm' is 'LIMES'.
Can you help me to learn more?
(Other definitions for limes that I've seen before include "boundary" , "Citrus fruits" , "Citrus fruit" , "Green fruits" , "Pieces of fruit" .)