Faithful story: genuine case (5)
I believe the answer is:
liege
'faithful' is the definition.
(I've seen this in another clue)
'story genuine case' is the wordplay.
'story' becomes 'lie' (story can mean a fabrication).
'case' suggests removing the centre.
'genuine' with its middle removed is 'ge'.
'lie'+'ge'='LIEGE'
(Other definitions for liege that I've seen before include "A person holding land under feudalism" , "European university" , "Loyal subject" , "Bound to render feudal service" , "Belgian city on Meuse" .)