Possible Clues:

• Exciting finish
• Boycott with good strike
• Sound suggested by the first letters of the words in 17-, 26-, 44- and 58-Across
• When doubled, attention-grabbing
• Block Greek leader causing crash
• Resounding blow
• Blast sound
• Repeated word in Danger Danger hit
• Speak at length? Not on drug injection
• The big report for the North is in the bag!