Possible Clues:

• What junkies get without fruit-based vitamin supplements
• Housing expansions
• That's more like it with them
• Put the extra bit on, son; it will make more for them
• It is an odd, rather unusual, way to get extras
• Put them on before it before what is on the end of it
• Put one - or more - on it, son
• Add two, by the sound of them, to make them (9)
• For them there is no M in us
• How a learned man gets it with an extra NNNNNNNNNN, perhaps