Related Clues:

• Singularly
• See 21 Across
• Wolf type
• Partnerless
• The __ Ranger (Tonto's pal)
• See 19 Across
• Admiral Byrd's book
• Like Texas' star
• Flying solo, e.g.
• "In bad company," according to Bierce
• Like Tonto's masked friend
• *With 7-Across, like a couple romancing
• As soloist
• Eremitic
• Last word of 'Farmer in the Dell'