Thrust home a point (4)
I believe the answer is:
stab
'thrust' is the definition.
(I know that thrust can be written as stab)
'home a point' is the wordplay.
I cannot really understand how this works, but
'a' is present in the answer.
'point' could be 's' (S is an example) and 's' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for stab that I've seen before include "pink" , "Wound with pointed weapon" , "Thrust at and pierce" , "Rough guess; to knife" , "Go" .)