Possible Clues:

• Stress I'd entered by mishap
• I would be in grave surroundings as a result of mishap
• Emphasise form of identity should be carried ... in case of this?
• Chance misfortune or injury
• A double century I make a hole in, but not 1 across
• I'd got in there by mistake, in a manner of speaking
• Priority's identification in disaster
• Unintended occurrence
• A double century I make a hole in, but all to no purpose
• Only a small measure I make a hole in (8)