Sound triumphant over new coin (5)

I believe the answer is:

crown

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'coin' is the definition.
(crown is a kind of coin)

'sound triumphant over new' is the wordplay.
'sound triumphant over' becomes 'crow' (I can't explain this - if you can you should believe this answer much more).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'crow'+'n'='CROWN'

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(Other definitions for crown that I've seen before include "Summit" , "Old five shilling piece" , "'Uneasy lies the head that wears a . . . . .'" , "repair for damaged tooth" , "Old coin; whack on head" .)

I've seen this clue in The Independent.

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