Scholarly fib about organised treat (8)
I believe the answer is:
literate
'scholarly' is the definition.
(I've seen this before)
'fib about organised treat' is the wordplay.
'fib' becomes 'lie' (a fib is a lie).
'about' means one lot of letters goes inside another.
'organised' indicates an anagram.
'treat' is an anagram of 'terat'.
'lie' enclosing 'terat' is 'LITERATE'.
(Other definitions for literate that I've seen before include "properly educated" , "version of 'speed of light'?" , "Well versed in books" , "well expressed" , "Erudite" .)