Which command would I use to clear an area of one type of block in MCBE?

/fill 0 0 0 10 10 10 air 0 replace stone 0

That command makes all stone air.
Leave the last number out (i.e. /fill 0 0 0 10 10 10 air 0 replace stone) to replace all blocks of that ID, in that example removing the 0 would replace stone, granite, etc.. Note the data value after the first ID is absolutely necessary.
Syntax:

/fill <from: x y z> <to: x y z> <tileName: Block> <tileData: int> replace [replaceTileName: Block] [replaceDataValue: int]