Related Clues:

• On the job
• On the go
• Working diligently
• Overly ornate
• Wrangling
• Arguing loudly
• Feuding
• Persisting
• Having one's nose to the grindstone
• Keep -- (persist)
• Locking horns
• Fighting, often with 'again'
• Up to no good
• Keep ___ (persist)
• Go ___ (tussle)