Ring wife being entertained by eccentric playwright (6)
I believe the answer is:
coward
'playwright' is the definition.
(Noel Coward)
'ring wife being entertained by eccentric' is the wordplay.
'ring' becomes 'o'.
'wife' becomes 'w'.
'being entertained by' means one lot of letters goes inside another (I've seen this in other clues).
'eccentric' becomes 'card' (I've seen this before).
'o'+'w'='ow'
'ow' put inside 'card' is 'COWARD'.
(Other definitions for coward that I've seen before include "Noel ......, composer of ''Bitter Sweet''" , "Mad Dogs and Englishmen songwriter" , "whose encounter was briefly filmed" , "Blithe Spirit playwright" , "Person lacking courage" .)