Answer: WORM

AnswerCrossword Clue
WORMType of malware
WORM"Inhabitant" of some tequila bottles
WORMComputer malady (and what can follow the starts of the four longest puzzle answers)
WORMComputer woe
WORMDirt denizen
WORMLive bait
WORMPoe's "conqueror"
WORMEarly bird's prize
WORMMinnow alternative
WORMMole's snack
WORMEarly bird's treat
WORMWriggly bait
WORMMole's prey
WORMTequila inclusion
WORMProgram that attacks computers
WORMCad
WORMLowlife
WORMApple eater
WORMFishhook attachment
WORMVirus kin
wormny of numerous relatively small elongated usually naked and soft-bodied animals (as a grub, pinworm, tapeworm, shipworm, or slowworm)
WORMEarly bird victim
WORMBook liver?
WORMBreakdancing move, with "the"
WORMDance done face-down
WORMBit of bait
WORMMalware app
WORM"Conqueror" in a Poe poem
WORM"Thou owest the ... no silk": King Lear
WORMComputer malady
WORMComputer problem
WORMLives in a book?
WORMComputer concern
WORMDraw (out) craftily
WORMEarly bird's victim
WORMLow life?
WORMApple invader
WORMSpineless one
WORMPoe's "The Conqueror ..."
WORMNight crawler