Crossword Genius

Partygoer stealing silver is one causing much damage (7)

Ross

I believe the answer is:

ravager

'one causing much damage' is the definition.
(somebody who ravages)

'partygoer stealing silver' is the wordplay.
'partygoer' becomes 'raver' (I've seen this before).
'stealing' indicates putting letters inside.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'raver' enclosing 'ag' is 'RAVAGER'.

'is' acts as a link.

(Another definition for ravager that I've seen is " Person laying waste".)

I've seen this clue in The Guardian.
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