Crossword Genius

Without panic as fans are expected to behave (6)

Ross

I believe the answer is:

coolly

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'without' is the definition.
Both the definition and answer are adverbs.
Maybe you can see a link between them that I can't see?

I cannot understand how the remainder of the clue works.

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(Another definition for coolly that I've seen is " with reserve".)

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