Crossword Genius

Find uranium in thorium's vicinity (7)

Ross

I believe the answer is:

unearth

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

'find' is the definition.
(I know that unearth is a more specific form of the action locate)

'uranium in thorium's vicinity' is the wordplay.
I cannot really understand how this works, but
'uranium' could be 'u' (U is the chemical symbol for uranium) and 'u' is present in the answer.
'thorium' could be 'th' (Th is the chemical symbol for thorium) and 'th' is found in the answer.
The remaining letters 'near' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for unearth that I've seen before include "Dig up or find for haunter" , "dredge up" , "Disconnect terminal" , "Disclose" , "reveal" .)

I've seen this clue in The Daily Express.
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