Found in caramel, an incredible colour (7)

I believe the answer is:

melanin

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'colour' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'found in caramel an incredible' is the wordplay.
'found in' indicates the answer is hidden within the clue.
'MELANIN' can be found hidden inside 'caramel an incredible'.

Can you help me to learn more?

(Other definitions for melanin that I've seen before include "Dark skin pigment" , "Pigment responsible for tanning" , "Brown skin pigment" , "Light-absorbing skin pigment" , "Tanning pigment in skin" .)

I've seen this clue in The Guardian.

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