Beat both badly, outright! (5)

I believe the answer is:

throb

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

'beat' is the definition.
(I know that throb is a type of beat)

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

Can you help me to learn more?

(Other definitions for throb that I've seen before include "Beat quickly from excitement etc" , "Pulsate with force" , "Vibrate with rhythm like heart" , "One's heart may do it" , "Palpitate, quiver (with emotion)" .)

I've seen this clue in the Evening Standard.

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