Starting from here in confidence by barge (6)
I believe the answer is:
thrust
'starting from here' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'in confidence by barge' is the wordplay.
'in' indicates putting letters inside.
'confidence' becomes 'trust' ('trust' can be a synonym of 'confidence').
'by barge' becomes 'h' (I am not sure about this - if you are sure you should believe this answer much more).
'trust' enclosing 'h' is 'THRUST'.
Can you help me to learn more?
(Other definitions for thrust that I've seen before include "force in argument" , "Force from jet engine" , "Push forward as with fencing sword" , "Violently push -- gist" , "Lunge forward" .)