Stories about origin of money trees (5)
I believe the answer is:
limes
'trees' is the definition.
(lime is a kind of tree)
'stories about origin of money' is the wordplay.
'stories' becomes 'lies' (to tell stories can mean to lie).
'about' means one lot of letters goes inside another.
'origin of' indicates taking the first letters.
The first letter of 'money' is 'm'.
'lies' going around 'm' is 'LIMES'.
(Other definitions for limes that I've seen before include "Citrus fruits" , "Pieces of fruit" , "boundary" , "Green fruit" , "Citrus trees" .)