Possible Clues:

• You'd swear you were present at the match
• Declare when playing cricket match
• Demonstrate with a time trial
• Declare, witnessing declaration perhaps?
• Witness the match, being present
• Witness it, being at the match
• Witness cheers up ahead of trial
• Being present at the match, one will witness it
• Where you may see England and Australia declare
• Tell it to the judge