Possible Clues:

• Persevering
• Meticulous editing redone inserting line
• Tipped top bloke, accepting I will be conscientious
• Recall top independent male that's civilised and hard working
• Raising hat, single chap is earnest
• Tipping hat, single man is assiduous
• Persevering at a task
• Hard-working policeman's fired, having concealed information
• Studious learner involved in editing novel
• Tipping hat, one overseeing man, hard-working