Related Clues:

• In disagreement or dispute
• Like perennial rivals, constantly
• Doesn't make sense for dads to collapse
• In a shouting match, perhaps
• Busily engaged
• On task
• Attacking the task
• A bird is busy
• A barber's in conflict
• In conflict, notices fox is caught
• A nasty barber's quarrelling
• A barber's not gelling
• A barber's having a disagreement
• Disagreeing 38 letters will include two Ds
• Occupied in some way