It's travelled fast, leading to hurly-burly? (7)
I believe the answer is:
tornado
'it's travelled fast' is the definition.
'leading to hurly-burly?' is the wordplay.
'leading to' becomes 'torn' (I am not sure about this - if you are sure you should believe this answer much more).
'hurly-burly?' becomes 'ado' (I've seen this in another clue).
'torn'+'ado'='TORNADO'
Can you help me to learn more?
(Other definitions for tornado that I've seen before include "Destructive wind vortex" , "A violent and destructive whirlwind" , "Donator (anag.)" , "RAF fighter; whirlwind" , "Strong wind" .)