The tag alias #76271 alto_clef -> c_clef has been approved.
Reason: https://en.wikipedia.org/wiki/Clef#Placement_on_the_staff
C clef is called alto clef only if placed on third line.
Since those tag usually refers the symbol itself not state of staff, and Tenor clef also uses same c clef, c clef seems more appropriate name.
EDIT: The tag alias alto_clef -> c_clef (forum #447354) has been approved by @spe.
Updated by auto moderator