Possible Clues:

• Fish that's been smoked
• Freshwater silvery fish with reddish-brown fins
• Writer Mary who specializes in popular science
• House pest, informally
• American insect's joint end
• Final section of joint unfinished choral works
• Fish — mention removing head
• Home invader
• Fish to open up after head's been chopped off
• Household insect, briefly