He will be prepared for a venture (5)
I believe the answer is:
scout
'he will be prepared for a venture' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for scout that I've seen before include "Lookout or pathfinder" , "One searches for and recruits talented people" , "Information-gathering soldier" , "Person sent out to gain information" , "One on a recce mission" .)