Sultana has no right stare (4)

I believe the answer is:

gape

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

'stare' is the definition.
(I know that gape is a type of stare)

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

Can you help me to learn more?

(Other definitions for gape that I've seen before include "Stare at page" , "Appear amazed" , "Look with mouth wide open" , "Open-mouthed stare" , "Look open-mouthed" .)

I've seen this clue in the Sydney Morning Herald.

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