Such a scout needs to have initiative (7)
I believe the answer is:
venture
'initiative' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for venture that I've seen before include "Proceed despite risk" , "Enterprise involving risk" , "Dare to put forward" , "Dare, take a chance" , "Undertaking that involves risk" .)