Pagan celebration wrecked altar in USA (10)

I believe the answer is:

saturnalia

I'm a little stuck... Click here to teach me more about this clue!

'pagan celebration' is the definition.
'saturnalia' can be an answer for 'celebration' (saturnalia is a kind of celebration). I'm not certain of the 'pagan' bit.

'wrecked altar in usa' is the wordplay.
'wrecked' indicates an anagram.
'altar'+'in'+'usa'='altarinusa'
'altarinusa' is an anagram of 'SATURNALIA'.

Can you help me to learn more?

(Other definitions for saturnalia that I've seen before include "Old festival" , "revels" , "orgy" , "wild party" , "Wild Roman festival" .)

I've seen this clue in The Independent.

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