Part of an arable area (3)
I believe the answer is:
lea
'part of an arable area' is the definition.
'lea' can be an answer for 'area' (lea is a kind of area). I'm unsure of the 'part of an arable' bit.
'of an arable area' is the wordplay.
'of' indicates a hidden word.
'LEA' is hidden in the letters of 'arable area'.
Can you help me to learn more?
(Other definitions for lea that I've seen before include "Poetically, a piece of meadow or pasture" , "Open country" , "River flowing through London" , "'The lowing herd wind slowly o'er the . . .'" , "Open arable land (poet.)" .)