Related Clues:

• Continue steadfastly, always wearing blue
• Refuse to give up appearing always in dark blue
• Continue being serious, trailing retreating agent …
• Exercises Rex finds demanding? Struggle on!
• Theatre turns hard to endure? Don't give up
• Continue - stick to one's guns
• Keep trying
• Soldier on
• Push on
• Continue despite adversity
• Fight on when right cut breaks much of skin
• Fight on through cut to side of eye
• Continue (against odds)
• Keep going for each cut key
• Keep at it, like Percy Holmes?