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Othello was said to be so secure in Venice (4)

Ross

I believe the answer is:

moor

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'othello' is the definition.
(Shakespeare's Othello is a Moor)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for moor that I've seen before include "Heathery upland" , "Tether (a boat)" , "Old North African" , "Heathland" , "Fasten" .)

I've seen this clue in The Globe and Mail.
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