Possible Clues:

• Means to an end
• Index Pete devised as means to an end
• Convenient means to remove mass from old gable
• Once confined, breathe one's last inside — it's practical
• Old and deep tin used as suitable
• Practical divorcee exercises with nuts originally in regimen
• No longer taking exercise, one in depression needed to get fit
• Extra exercise with fancy new diet is appropriate
• Convenient and effective
• Advisable