Knack"er (?), n.
1.
One who makes knickknacks, toys, etc.
Mortimer.
2.
One of two or more pieces of bone or wood held loosely between the fingers, and struck together by moving the hand; -- called also clapper.
Halliwell.
© Webster 1913.
Knack"er, n. [Cf. Icel.hnakkr a saddle.]
1.
a harness maker.
[Obs. or Prov. Eng.]
Halliwell.
2.
One who slaughters worn-out horses and sells their flesh for dog's meat.
[Eng.]
© Webster 1913.