Narrowly defeat Philip (3)
I believe the answer is:
pip
I believe this clue is a double definition.
'narrowly defeat' is the first definition.
(I've seen this before)
'philip' is the second definition.
(can be a nickname for Philip)
(Other definitions for pip that I've seen before include "Mark of rank" , "Narrowly beat" , "Dickensian hero" , "Spot (on card); seed (of fruit)" , "Small fruit seed" .)