  We study the Ho$^{14+}$ ion as a candidate for extremely accurate and stable
optical atomic clock which is sensitive to the time variation of the fine
structure constant. We demonstrate that the proposed system has all desired
features including relatively strong optical electric dipole and magnetic
dipole transitions which can be used for cooling and detection. Zero quadrupole
moments for the relevant states in the clock transition allows interrogating
multiple ions to improve the clock stability.
