Brave Leander's mate confronting a bit of panic (6)

I believe the answer is:

heroic

I'm a little stuck... Click here to teach me more about this clue!

'brave' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for heroic that I've seen before include "Valiant, courageous" , "Courageous - daring" , "larger than life" , "Showing no fear in the face of extreme difficulty" , "Gallant" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app