Crossword Genius

Dupin's alter ego in Silk Road city ignoring a character (4)

Ross

I believe the answer is:

sand

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'character' is the definition.
(I know that sand is a type of fortitude)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for sand that I've seen before include "George - - (French authoress)" , "Granular substance" , "Rub down (for painting)" , "Seaside castle-building material" , "Fine stone particles" .)

I've seen this clue in The Telegraph.
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