Only exit plane crash aggressively (13)

I believe the answer is:

exponentially

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'aggressively' is the definition.
Both the answer and definition are adverbs. Perhaps there's an association between them I don't understand?

'only exit plane crash' is the wordplay.
'crash' indicates an anagram.
'only'+'exit'+'plane'='onlyexitplane'
'onlyexitplane' with letters rearranged gives 'EXPONENTIALLY'.

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I've seen this clue in the Sydney Morning Herald.

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