"You have a point" (4)
I believe the answer is:
true
'you have a point' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for true that I've seen before include "not showing 12 [DISHONESTY]" , "Supported by the facts" , "Straight or correct" , "Dependable -- loyal" , "Factually correct" .)