Ortanique 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.
(tanning is a kind of colouring)

'ortanique' is the wordplay.
'TAN' is hidden within the letters.
But, I'm unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for tan that I've seen before include "Acquire a sunburn" , "Go brown" , "Turn hide into leather" , "belt" , "Lie in sun" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app