Convict escapes, bars open, risk uncertain? (6,6)

'bars open risk uncertain?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'convict escapes' is the wordplay.
I cannot really see how this works, but
'escapes' could be 'breaks' (break is a kind of escape) and 'breaks' is found within the answer.
The remaining letters 'prison' 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?