Reveals what's essentially sung over Lily Savage's entrance (7)

I believe the answer is:

unveils

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'reveals' is the definition.
('unveil' can be a synonym of 'reveal')

'essentially sung over lily savage's entrance' is the wordplay.
'essentially' means to look at the middle letters.
'over lily' becomes 'veil' (I can't justify this - if you can you should give a lot more credence to this answer).
'entrance' suggests taking the first letters.
The middle of 'sung' is 'un'.
The initial letter of 'savages' is 's'.
'un'+'veil'+'s'='UNVEILS'

'what's' is the link.

Can you help me to learn more?

(Other definitions for unveils that I've seen before include "Removes the covering" , "Shows for the first time" , "Reveals to view" , "Reveals, uncovers" .)

I've seen this clue in The Independent.

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