It’s in the field of rice production (5)
I believe the answer is:
paddy
'field of rice production' is the definition.
'paddy' can be an answer for 'field' (paddy is a kind of field). I am not certain of the 'of rice production' bit.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for paddy that I've seen before include "show of anger" , "area for rice-growers" , "Field where rice is grown" , "Rice-field" , "Sort of wagon" .)