Instant sunburn! (3)

I believe the answer is:

tan

I'm a little stuck... Click here to teach me more about this clue!

'sunburn' is the definition.
(synonyms)

'instant' is the wordplay.
'TAN' is hidden in amongst the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for tan that I've seen before include "Thrash" , "Curry" , "Sun-baked colour" , "Tawny" , "Lie in sun" .)

I've seen this clue in the Evening Standard.

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