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Invader,
giant
somewhat
heartless
(4)
Invader, giant somewhat heartless (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Invader — one of those Germanic tribes that sacked Rome. Now, take the giant GOLIATH, rip out his heart (the middle letters LIA), and what you're left with is GO and TH — put them back together and there's your answer.