Prince and Horatio finally getting ring (4)
I believe the answer is:
halo
'ring' is the definition.
(I know that ring can be written as halo)
'prince and horatio finally' is the wordplay.
'prince' becomes 'hal' (Shakespearean nickname of Henry V when a prince).
'and' means one lot of letters go next to another.
'finally' indicates one should take the final letters.
The last letter of 'horatio' is 'o'.
'hal'+'o'='HALO'
'getting' acts as a link.
(Other definitions for halo that I've seen before include "overhead lighting?" , "Saint's headlight?" , "Symbol of sainthood" , "Saint's overhead ring of light" , "Saintly ring" .)