Possible Clues:

• It is, in code, mister, a friend
• Fellow socialist or good friend
• Cold war term of address
• Colleague to address academy in secret writing
• Former address of the Kremlin
• Former address at the Kremlin
• Advance, holding attack: one may fall?
• Firm forced to engage Republican associate
• Liberal Democrat has no time for fellow socialist
• Fellow worker in firm forced to keep rule only to begin with