Crack open clue and reveal great riches (8)

I believe the answer is:

opulence

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

'riches' is the definition.
(I've seen this in another clue)

'crack open clue' is the wordplay.
'crack' indicates anagramming the letters.
'open'+'clue'='openclue'
'openclue' with letters rearranged gives 'OPULENCE'.

'and reveal great' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for opulence that I've seen before include "State of affluence and luxury" , "Means" , "Conspicuous wealth" , "State of great prosperity" , "Profusion, luxury" .)

I've seen this clue in The Guardian.

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