Beat broth into a pulp (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)

'broth into a pulp' is the wordplay.
'broth' anagrams to 'THROB'.
However, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for throb that I've seen before include "Pound" , "Pulsate with force" , "Vibrate with rhythm like heart" , "Have strong or irregular heartbeat" , "Pulse" .)

I've seen this clue in The Globe and Mail.

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