An example Ann cites inaccurately (8)
I believe the answer is:
instance
'an example' is the definition.
(I know that example can be written as instance)
'ann cites inaccurately' is the wordplay.
'inaccurately' is an anagram indicator.
'ann'+'cites'='anncites'
'anncites' with letters rearranged gives 'INSTANCE'.
(Other definitions for instance that I've seen before include "A case or example of something" , "Case - isn't acne (anag)" , "Case in point" , "Case or example from ancients" , "An insect (anag.)" .)