Bonus point (3)
I believe the answer is:
tip
I believe this is a double definition.
'bonus' is the first definition.
(I've seen this before)
'point' is the second definition.
(tip is a kind of point)
(Other definitions for tip that I've seen before include "Pointed extremity" , "The extreme end of something" , "Small amount" , "Empty" , "Grtatuity" .)