Possible Clues:

• Culprit has reason to put in a bid
• Not right for one to have cut the tail off
• It's criminal of the guard
• Miscreant makes proposition about outcome
• Is he criminally tactless?
• Volunteer harbours aim to see transgressor
• Criminal proposal to encompass death
• Perhaps it's the docker that's in the wrong
• The sort of docker, perhaps, that may get prosecuted
• Criminal's proposal to finish inside