Intermediate puzzle with new opening (6)
I believe the answer is:
middle
'intermediate' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for middle that I've seen before include "(A person's) waist" , "Median" , "Centre, halfway" , "Centre point" , "One of 21 [HEARTS]" .)