Possible Clues:

• Molly Malone may not have been, but she did, by the sound of it
• Molly Malone might not have been, but did it, by the sound of it
• What Molly Malone did, by the sound of it, but what she may not have been
• Egocentric son's angle on the Spanish
• Molly Malone did this, by the sound of it, but may not have been this
• Me-first
• Looking after number one is seen in unrestrained flesh
• No altruist
• Putting own interests first
• Overconcerned with yours truly