Republican slyly spilling the beans in field? (3)
I believe the answer is:
lea
'in field?' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lea that I've seen before include "grazing area" , "area of grassland" , "authority for teachers" , "Field" , "Open area of grassy or arable land" .)