What Moscow beggar may do, crossing certain junction, is take risks (3,3,7)
I believe the answer is:
ask for trouble
'what moscow beggar may do crossing certain' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'junction is take risks' is the wordplay.
I cannot quite understand how this works, but
'junction' could be 't' and 't' is found in the answer.
'take' could be 'ask' (synonyms) and 'ask' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for ask for trouble that I've seen before include "Provoke retaliation" , "expose oneself to difficulties" , "Behave provocatively" , "Invite difficulty by one's actions" , "Act in a way likely to incur difficulties" .)