Tomb of Argos chap surprisingly just discovered (11)

I believe the answer is:

sarcophagus

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

'tomb' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'argos chap surprisingly just discovered' is the wordplay.
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'discovered' says to take the centre (dis-covered - outer letters removed).
The central letters of 'just' are 'us'.
'argos'+'chap'='argoschap'
'argoschap' anagrammed gives 'sarcophag'.
'sarcophag'+'us'='SARCOPHAGUS'

'of' acts as a link.

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 Telegraph.

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