Inconstant colour? (3)

I believe the answer is:

tan

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

'colour?' is the definition.
(I know that tan is a colour)

'inconstant' is the wordplay.
'TAN' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for tan that I've seen before include "Reddish-brown" , "Prepare leather" , "Tawny" , "The colour of sunburn" , "Healthy sun-burned colour" .)

I've seen this clue in the Evening Standard.

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