Crossword Genius

Seek earthly riches? (3,3,4)

Ross

I believe the answer is:

dig for gold

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

'seek earthly' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'riches?' is the wordplay.
I cannot really understand how this works, but
'riches?' could be 'gold' (gold is a kind of riches) and 'gold' is found within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution? Install my app