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Old photo more likely to exude its fluid, you say? (5)

Ross

I believe the answer is:

sepia

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'old photo' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sepia that I've seen before include "Shade of brown, as in old photographs" , "Brown pigment produced from cuttlefish ink" , "Sort of ink" , "Brownish tint or pigment" , "Brownish tone associated with old photographs" .)

I've seen this clue in The Everyman puzzle in The Observer.
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