Crop bringing anger to the workers' leader (5)
I believe the answer is:
wheat
'crop' is the definition.
'anger to the workers' leader' is the wordplay.
'anger' becomes 'heat' (I've seen this in another clue).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'leader' suggests taking the first letters.
The first letter of 'workers' is 'w'.
'heat' put after 'w' is 'WHEAT'.
'bringing' acts as a link.
(Other definitions for wheat that I've seen before include "(Pasta) cereal" , "Cereal grass" , "Source of flour" , "Cereal plant" , "A cereal, to be separated from chaff" .)