Crop bringing anger to the workers' leader (5)
I believe the answer is:
wheat
'crop' is the definition.
(I know that wheat is a type of cereals and pseudocereals)
'anger to the workers' leader' is the wordplay.
'anger' becomes 'heat' (I've seen this in another clue).
'to' means one lot of letters go next to another (I've seen this in other clues).
'leader' suggests taking the first letters.
The initial letter of 'workers' is 'w'.
'heat' 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" .)