Crossword Genius

Republican slyly spilling the beans in field? (3)

Ross

I believe the answer is:

lea

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'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" .)

I've seen this clue in the Sydney Morning Herald.
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