Scoff, incredulously, receiving casket in America (6)

I believe the answer is:

coffin

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'casket in america' is the definition.
'coffin' can be an answer for 'casket' (synonyms). I'm not certain of the 'in america' bit.

'scoff incredulously receiving' is the wordplay.
'COFFIN' is hidden within the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for coffin that I've seen before include "Box for burial" , "Corpse's chest" , "Box for a corpse" , "Casket for the dead" , "Sarcophagus" .)

I've seen this clue in The Irish Times.

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