Crossword Genius

Pass a grouch, all out of sorts, in final resting place (11)

Ross

I believe the answer is:

sarcophagus

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

'resting place' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'pass a grouch all out of sorts in final' is the wordplay.
'pass a grouch' anagrams to 'SARCOPHAGUS'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sarcophagus that I've seen before include "form of coffin" , "Final box" , "Stone coffin" .)

I've seen this clue in The Irish Times.
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