Definition from Wiktionary, the free dictionary
standard-bearer (plural standard-bearers)
- A person who carries a flag or banner (a standard).
- The standard-bearer in battle is in the center of the front line so the following troops know where to go; unfortunately, it also shows the enemy where to shoot.
- (figuratively) A person who visibly leads.
- He became the standard-bearer for their cause because of his celebrity.