Old king has points expanded (4)
I believe the answer is:
grew
'expanded' is the definition.
(I've seen this in another clue)
'old king has points' is the wordplay.
'old king' becomes 'GR' (Georgius Rex, Latin for King George).
'has' says to put letters next to each other.
'points' becomes 'ew' (east and west, two compass points).
'gr'+'ew'='GREW'
(Other definitions for grew that I've seen before include "Became larger" , "Increased in size" , "Got larger" , "Developed, matured" , "Multiplied" .)