Piece of pleasant land (3)
I believe the answer is:
lea
'land' is the definition.
(I've seen this before)
'piece of pleasant' is the wordplay.
'piece of' says the answer is hidden in the clue.
'LEA' is hidden within 'pleasant'.
(Other definitions for lea that I've seen before include "Open area of grassy or arable land" , "Poetically, a piece of meadow or pasture" , "River of east London" , "River flowing through London" , "authority for teachers" .)