Crossword Genius

Bull ring? (5)

Ross

I believe the answer is:

inner

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This clue could be a double definition.

'bull' is the first definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

'ring?' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for inner that I've seen before include "More secret, private" , "red" , "Located inside" , "Nearer to the centre, deeper" , "(Of thoughts) intimate - (of circles) privileged" .)

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