Very keen, when the herd stampedes, to run (3-3)

I believe the answer is:

red-hot

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

(Other definitions for red-hot that I've seen before include "likely to win" , "Extremely heated" , "Sizzling" , "Very exciting - glowing" , "Nearly incandescent?" .)

I've seen this clue in the Evening Standard.

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