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Hole in one, assuredly, 5 letters
Outlandish bit of luck, 5 letters
Result of careful planning it's not, 5 letters
Serendipitous occurrence, 5 letters
Stroke of good luck, 5 letters
Winning the lottery, say, 5 letters
Either of the two lobes of the tail of a cetacean, 5 letters
Parasitic flatworms having external suckers for attaching to a host, 5 letters
Flat blade-like projection on the arm of an anchor, 5 letters
A barb on a harpoon or arrow, 5 letters
Succeeded accidentally, 6 letters
Strokes of good luck, 6 letters
Strokes of unanticipated luck, 6 letters
Subject to accident, chance or change, 6 letters
More oddly coincidental, 7 letters
Most subject to chance, 8 letters
Amazingly coincidental, 5 letters
Happening by accident, 5 letters
Lucky to go by plane around Britain, 5 letters
Serendipitous, perhaps, 5 letters
Subject to random chance, 5 letters
Writing assignment that, through complete luck, got an A?, 10 letters