Ruby of "A Raisin in the Sun" (3)
I believe the answer is:
dee
'ruby of a raisin in the sun' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dee that I've seen before include "John ---, Elizabethan mage" , "Aberdeen's river" , "Welsh/English river" , "Balmoral's river" , "Aberdeenshire river" .)