Model answer about writer (5)
I believe the answer is:
aesop
'writer' is the definition.
(I've seen this before)
'model answer about' is the wordplay.
'model' becomes 'pose' (model can mean to pose).
'answer' becomes 'a' (abbreviation eg in Q and A).
'about' says the letters should be written in reverse.
'pose'+'a'='posea'
'posea' written backwards gives 'AESOP'.
(Other definitions for aesop that I've seen before include "Great Greek teller of animal fables" , "A pose by Greek writer of fables" , "story teller" , "Fabulous man" , "Greek fable writer" .)