Related Clues:

• Tough walk
• Go through mud
• Make one's way through mud
• Plod through the mud
• Struggle (through), as mud
• Long, hard grind
• Hit record following Sinatra's number one
• Hit hard — hard work
• Laborious process
• Uphill climb, say
• Left halfway through really good work
• Rough going
• Interminable task
• Make slo-o-o-ow progress
• Laborious task