One's report initiates speedy action (8,6)

'one's report initiates speedy action' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'one's report initiates speedy action' is the wordplay.
I cannot really understand how this works, but
'one's' could be 'is' (roman numeral) and 'is' is found in the answer.
'action' could be 'start' (start is a kind of action) and 'start' is found in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?