Related Clues:

• Show doggedness
• Continue (against odds)
• Keep going for each cut key
• Continue (in spite of difficulties)
• Keep at it, like Percy Holmes?
• Continue against the odds
• Parisian parent about to split should give it another try
• Obstinately continue
• Continue alone, always digging in
• Continue despite difficulties
• Battle on
• Press on, essentially, always getting involved
• Refuse to stop as such, always being hemmed in
• Exercise runs very demanding? Don't give up!
• Soldier on exercises runs hard