Possible Clues:

• Right for inclusion in theatrical hamper
• Confine - muscular spasm
• Involuntary muscular contraction
• That may get one in its painful grip with an inclination at last
• Vice writers may be familiar with
• Form of muscular pain
• Muscular spasm, very painful
• Climber's aid not on? That can be painful
• Writer's pain
• With a muscular problem an athlete has little power