spear carrier

/S P IH1 R K AE1 R IY0 ER0/
noun
  1. 1

    A person in a play or movie with a minimal part; an extra.

  2. 2

    (by extension) One who serves in a subordinate or menial role.

  3. 3

    One who plays a leading or substantial role as a supporter, proponent, etc. representing a group, cause, or point of view.

Source: https://en.wiktionary.org/wiki/spear%20carrier