Center letter: i
Outer letter: c e g l n x
Answers (41):
  excelling
  ceiling
  celli
  cling
  clinging
  clinic
  egging
  engine
  exile
  exiling
  gelling
  genie
  genii
  gigging
  giggle
  giggling
  gill
  gilling
  ginning
  icicle
  icing
  incline
  inclining
  innie
  inning
  legging
  lenience
  lice
  liege
  lien
  line
  linen
  lining
  negligee
  negligence
  nice
  niece
  niggle
  niggling
  nine
  nixing