Lovers of the phonetic alphabet (5,3,6)
I believe the answer is:
romeo and juliet
I believe this clue is a double definition.
'lovers' is the first definition.
(lovers in Shakespeare's play)
'of the phonetic alphabet' is the second definition.
(R and J in the NATO phonetic alphabet)
(Other definitions for romeo and juliet that I've seen before include "letters used on radio" , "were mixed up in quarrel over houses" , "song - with 21d" , "Play about lovers" , "Unfortunate pair" .)