Old photo tint (5)
I believe the answer is:
sepia
'old photo tint' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sepia that I've seen before include "Reddish brown -- ie sap (anag)" , "Colourant" , "Colour from cuttlefish ink" , "Brown tone associated with old photographs" , "Denizen of deep" .)