Crossword Genius

Sphere in which your fortune may lie (7,4)

Ross

I believe the answer is:

crystal ball

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

'in which your fortune may lie' is the definition.
The definition suggests a singular noun which matches the answer.

'sphere' is the wordplay.
I cannot quite see how this works, but
'sphere' could be 'ball' (ball is a kind of sphere) and 'ball' is found in the answer.
The remaining letters 'crystal' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for crystal ball that I've seen before include "Gaze here to see the future" , "Fortune-teller's essential equipment?" , "Fortuneteller's globe" , "see the result first in here?" , "Glass globe" .)

I've seen this clue in The Guardian.
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