Crossword Genius

I heard you are the guy letting fly extremes compelling immediate action (8)

Ross

I believe the answer is:

urgently

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'i heard you are the guy letting fly extremes' is the definition.
I can't judge whether this defines the answer.

'compelling immediate action' is the wordplay.
'compelling' becomes 'urgent' (I've seen this before).
'immediate action' becomes 'ly' (I can't explain this - if you can you should believe this answer much more).
'urgent'+'ly'='URGENTLY'

Can you help me to learn more?

(Other definitions for urgently that I've seen before include "as quickly as possible?" , "without delay" , "Pressingly" , "With speedy attention" , "As a matter of priority" .)

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