His honour can be reassuring (5)
I believe the answer is:
scout
'his honour can be reassuring' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for scout that I've seen before include "One searches for and recruits talented people" , "Member of a youth movement" , "Soldier on a recce mission" , "Person on the lookout" , "Information-gathering soldier" .)