Robin needs bravery when second flees (4)

I believe the answer is:

puck

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'robin' is the definition.
(Shakespeare character Puck or Robin Goodfellow)

I can't explain the remainder of the clue.

(Other definitions for puck that I've seen before include "Fairy - ice hockey "ball"" , "something a bit like a mouse" , "In summer, one dreamt" , "Mischievous sprite, Robin Goodfellow (AMND)" , "one spun across the ice" .)

I've seen this clue in The Times.

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