Pulse that’s here resembling ordinary bean, first of all (5)
I believe the answer is:
throb
'pulse' is the definition.
(synonyms)
'that's here resembling ordinary bean first of all' is the wordplay.
'first of all' indicates taking the first letters.
The initial letters of 'that here resembling ordinary bean' is 'THROB'.
(Other definitions for throb that I've seen before include "Sound of engines" , "Strong rhythmic beat" , "Strong regular beat" , "Martin -; Kingsley -" , "Drum" .)