Peruvian with fashion-forward loo (5)

I believe the answer is:

incan

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

'peruvian' is the definition.
(I have seen 'Old Peruvian ' mean 'incan' so perhaps 'peruvian' could also mean 'incan')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for incan that I've seen before include "From old Peru" , "Pachacuti for example" , "Royal Family member" , "Of former Peruvian race" , "about S American Indians" .)

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