Possible Clues:

• She may be overweight, but she can't be this
• Just like her old man, she is overweight
• Plump for Mercury without funny hat, the old perpetual roller
• Old man is down, short of energy
• How divine that she may have put on weight
• The - of the House is the longest-serving MP
• A way to drink the pop
• Detective's brother fawn perhaps
• He makes her overweight
• There's too much of her for him