Starts to feel angry, raiding merchant’s till (4)
I believe the answer is:
farm
'till' is the definition.
(thesaurus)
'starts to feel angry raiding merchant's' is the wordplay.
'starts to' indicates taking the first letters.
The initial letters of 'feel angry raiding merchants' is 'FARM'.
(Other definitions for farm that I've seen before include "Rural establishment" , "Agricultural building" , "Country workplace" , "Grow crops or livestock" , "Manage land for crops or livestock" .)