Gershwin's turned up, covering for Indian (4)
I believe the answer is:
sari
'up covering for indian' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'gershwin's turned' is the wordplay.
'gershwin's' becomes 'ira's' (lyricist Ira Gershwin, brother of George).
'turned' says the letters should be written in reverse.
'iras' written backwards gives 'SARI'.
Can you help me to learn more?
(Other definitions for sari that I've seen before include "habit" , "Indian costume" , "Traditional dress of Hindu women" , "Traditional dress of Indian women" , "Something worn" .)