Possible Clues:

• No going back to the name before Stallone behind someone's back
• Underhand — only Seth (anag)
• Broadcast and article clever behind someone's back
• Just including actor in first half, surreptitiously
• To avoid publicity
• Behind one's back
• Acting furtively, although honestly in trouble
• Secretly or furtively
• Done in an unpleasant and secret way
• Honestly shifting around -- in a furtive way