Related Clues:

• What a staff is made of
• Anger between husband and son results in charges
• Adds to the work force
• ''Initial'' root beer brand
• Brings into a company
• Classic root beer brand
• Adds employees
• Oldest restaurant chain in America, founded in 1919
• Brings on to the team
• Root beer brand, and a phonetic hint to the three vowels of 18-, 23-, 37-, 55- and 60-Across
• "It's Good" root beer brand