Instant healthy looking colour? (3)

I believe the answer is:

tan

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'colour?' is the definition.
(tanning is a kind of colouring)

'instant healthy looking' is the wordplay.
'TAN' is hidden within the letters.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tan that I've seen before include "Brown to beat" , "Lie in sun" , "Prepare leather" , "Brown colour acquired from sun" , "belt" .)

I've seen this clue in the Evening Standard.

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