Possible Clues:

• Sternum
• Body part that includes the xiphoid process
• Best bra designed by individual to show bit of chest
• Brother born in Whitechapel, perhaps something close to his heart
• Informally, one’s sternum
• Absent bore (anag.)
• Item in trunk you are missing in British seaside resort
• Part of skeleton of second animal maybe one found across river?
• Wicked stabber may land on one
• What's in the chest? Port and wine, we hear