5 down
Fearless
Bobby
that’ll
open
the
Guardian
(6)
Fearless Bobby that’ll open the Guardian (6)
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The definition is at the beginning of the clue.
How the clue works
Start with Fearless — that's your definition sorted. Then take the singer Bobby Darin, whose surname gives you DARIN, and stick G on the end (the opening letter of "Guardian") to land on DARING.