Porgy's beloved (4)
I believe the answer is:
bess
'porgy's beloved' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bess that I've seen before include "Black - was Dick Turpin's horse" , "Elizabeth (dim.)" , "George Gershwin opera 'Porgy and . . . .'" , "Operatic mate for Porgy" , "Nickname for English queen" .)