Container of the richest treasures (5)

I believe the answer is:

chest

'container' is the definition.
(chest is a kind of container)

'of the richest treasures' is the wordplay.
'of' indicates the answer is hidden within the clue.
'CHEST' can be found hidden inside 'richest treasures'.

(Other definitions for chest that I've seen before include "Rib area" , "Trunk or crate" , "Treasure (or heart) container" , "Treasure box?" , "drawers in it!" .)

I've seen this clue in the Evening Standard.

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