Possible Clues:

• Much-feared natural disaster
• ''Huge'' fish that got away
• Major event, with "the"
• Earthquake that everyone's been waiting for
• It often gets away, so we've heard
• 1998 Michael Moore film, with 'The'
• No little of 27 across
• What the angler wanted got off in the end
• No little G.I. would turn up in so ossified a fashion
• The one that's likely to get away has got away at last