Possible Clues:

• (A person's) interest
• (On someone’s) account
• On -- of (for)
• For someone's advantage or benefit
• Play in team? One may substitute on someone else's
• Perform in panto horse perhaps? That creates interest
• In the interest of another, looking back it¿s just flab on person
• 'On this for someone else, one may be over two (6)'
• This might be one over two for one other on it
• It's not as much as one but could be over two