18 down
First
and
last
to
arrive
can
generate
conflict
(6)
First and last to arrive can generate conflict (6)
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The definition is at the end of the clue.
How the clue works
Look at conflict at the end — that's your definition. You take First, then the last letter of arrivE gives you the E, and can generate is your anagram indicator, so you shuffle FIRSTE around to get your answer.