10 across
Ring
with
number
for
trendsetter
(10)
Ring with number for trendsetter (10)
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The definition is at the end of the clue.
How the clue works
Look at trendsetter — that's your definition, someone others follow. For the wordplay, you're building it up piece by piece: BELL is a ring, W is the abbreviation for "with", and then ETHER is a "number" in the devious cryptic sense — not a numeral, but something that numbs you. Put them all together and there's your answer.