Pulse in broth getting stirred (5)
I believe the answer is:
throb
'pulse' is the definition.
(I know that pulse can be written as throb)
'broth getting stirred' is the wordplay.
'getting stirred' indicates anagramming the letters.
'broth' with letters rearranged gives 'THROB'.
'in' acts as a link.
(Other definitions for throb that I've seen before include "Pulse" , "Beat like heart" , "Martin -; Kingsley -" , "Sound of engines" , "Pulsate; regular beat" .)