Tell story, say, about Belgian city (5)
I believe the answer is:
liege
'belgian city' is the definition.
(I've seen this before)
'tell story say about' is the wordplay.
'tell story' becomes 'lie'.
'say' becomes 'eg'.
'about' says the letters should be written in reverse.
'eg' backwards is 'ge'.
'lie'+'ge'='LIEGE'
(Other definitions for liege that I've seen before include "Belgian, French-speaking city" , "City in eastern Belgium" , "Bound to render feudal service" , "Feudal lord or Belgian city" , "Loyal subject" .)