Crossword Genius

You can eat a third of one in a bus (4)

Ross

I believe the answer is:

buns

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

'you can' is the definition.
'buns' can be an answer for 'can' (synonyms). I am unsure of the 'you' bit.

'eat a third of one in a bus' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for buns that I've seen before include "Small rolls" , "Food items" , "Cakes" .)

I've seen this clue in the Evening Standard.
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