Name hidden in "double agent" (3)

I believe the answer is:

lea

(Other definitions for lea that I've seen before include "Meadowland" , "Open area of grassy or arable land" , "''The lowing herd winds slowly o'er the ... '' (Gray)" , "grazing area" , "'The lowing herd wind slowly o'er the . . .'" .)

I've seen this clue in the Universal.

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