Assemble a crowd, some of whom are yelling at heretics (6)
I believe the answer is:
gather
'assemble a crowd' is the definition.
'gather' can be an answer for 'assemble' (synonyms). I am not sure about the 'a crowd' bit.
'of whom are yelling at heretics' is the wordplay.
'of' says the answer is hidden in the clue.
'GATHER' is hidden in the letters of 'whom yelling at heretics'.
'some' acts as a link.
Can you help me to learn more?
(Other definitions for gather that I've seen before include "Collect or assemble" , "From information given, learn" , "Harvest; understand" , "Get together" , "Collect or come together" .)