Grazing some fragile area (3)
I believe the answer is:
lea
'grazing' is the definition.
(thesaurus)
'some fragile area' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'LEA' can be found hidden inside 'fragile area'.
(Other definitions for lea that I've seen before include "'The lowing herd wind slowly o'er the . . .'" , "Meadowland" , "authority for teachers" , "area of grassland" , "Meadow (poetic)" .)