Related Clues:

• Less lax
• Having less slack
• More restive
• Creating more tension
• More avant-garde
• More hip
• Less slack
• Having more indie cred
• More 'out there'
• Leader of expedition on rocky ridge becoming more nervous
• More tightly stretched
• More antsy
• More high-strung
• Rim covering his heart on right is less relaxed
• Creep runs round island, making one more nervous