Crossword Genius

Upset some runners? Let's hear about it (5,3,5)

Ross

I believe the answer is:

spill the beans

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

'runners? let's hear about it' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'upset some' is the wordplay.
I cannot quite see how this works, but
'upset' could be 'spill' (I've seen this in another clue) and 'spill' is found within the answer.
'some' could be 'a' and 'a' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for spill the beans that I've seen before include "Blurt out secret" , "Disclose, confess" , "Embarrassingly reveal a secret" , "Give away secrets" , "divulge information" .)

I've seen this clue in The Globe and Mail.
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