Possible Clues:

• Last one in, to a child
• Real stinker
• Last one in, so they say
• Despicable person, to a food critic?
• 'Last one in's a ___!'
• Carnivore on rocky hill climbing over head of gazelle that stinks
• Last one in, say
• Stinker, in more ways than one
• A stinker?
• Short-range missile