Crossword Genius

Intermediate puzzle with new opening (6)

Ross

I believe the answer is:

middle

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'intermediate' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for middle that I've seen before include "(A person's) waist" , "Median" , "Centre, halfway" , "Centre point" , "One of 21 [HEARTS]" .)

I've seen this clue in The Times.
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