Starting from here in confidence or that's the gist (6)
I believe the answer is:
thrust
'that's the gist' is the definition.
(thesaurus)
'starting from here in confidence' is the wordplay.
'starting from here' becomes 'h' (I am not sure about this - if you are sure you should believe this answer much more).
'in' is an insertion indicator.
'confidence' becomes 'trust' (synonyms).
'h' going within 'trust' is 'THRUST'.
'or' is the link.
Can you help me to learn more?
(Other definitions for thrust that I've seen before include "Shove forward" , "Sudden lunge or attack" , "Force producing motion" , "Push forcibly, say sword" , "Push forcefully" .)