Old story in something close to sepia? (8)
I believe the answer is:
chestnut
I believe this is a double definition.
'old story' is the first definition.
(thesaurus)
'something close to sepia?' is the second definition.
(chestnut and sepia are both shades of brown)
'in' acts as a link.
(Other definitions for chestnut that I've seen before include "''Underneath the spreading . . . . . . . . tree''" , "Golden-brown or reddish-brown horse" , "Tree fruit known informally as a conker" , "Golden to reddish brown colour" , "not a cracker!" .)