Crossword Genius

You can see one on a billiard ball (4)

Ross

I believe the answer is:

spot

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

'see one on a billiard ball' is the definition.
'spot' can be an answer for 'see' (to spot is to notice or catch sight of). I am unsure of the 'one on a billiard ball' bit.

'you can' is the wordplay.
'you' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'can' becomes 'pot' (synonyms).
's'+'pot'='SPOT'

Can you help me to learn more?

(Other definitions for spot that I've seen before include "make out" , "Informally, catch sight of" , "Notice; sign of acne" , "Mark - position - perceive" , "See; place" .)

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