Meadow inside clearing (3)
I believe the answer is:
lea
'meadow' is the definition.
(I've seen this before)
'inside clearing' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'LEA' is hidden in the letters of 'clearing'.
(Other definitions for lea that I've seen before include "''The lowing herd winds slowly o'er the ... '' (Gray)" , "Open country" , "grazing area" , "Open grassy land; river" , "area of grassland" .)