Good first point (4)
I believe the answer is:
gist
'point' is the definition.
(I've seen this before)
'good first' is the wordplay.
'good' becomes 'g' (abbreviation).
'first' becomes 'ist' (**).
'g'+'ist'='GIST'
(Other definitions for gist that I've seen before include "Main points" , "Basic meaning" , "Substance of an argument" , "Main point of the matter" , "Drift" .)