Brownish photo tint (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">brownish photo tint</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sepia that I've seen before include "Reddish-brown colour as in old photos" , "Sort of ink" , "Pigment obtained from cuttlefish ink" , "Reddish-brown; cuttlefish ink" , "Brown pigment produced from cuttlefish ink" .)