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 uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for tan that I've seen before include "Convert hide to leather" , "Get the effect of the sun." , "Lightish brown colour" , "Beat the colour" , "Lie in sun" .)

I've seen this clue in the Evening Standard.

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