Blast area for its white stone (9)

I believe the answer is:

alabaster

I'm a little stuck... Click here to teach me more about this clue!

'white stone' is the definition.
(I've seen this before)

'blast area for its' is the wordplay.
'blast area' can be anagrammed to 'ALABASTER'.
However, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Other definitions for alabaster that I've seen before include "Sort of gypsum" , "White or translucent mineral" , "Blast area for white mineral" , "Carved form of gypsum" , "medium of sculpture" .)

I've seen this clue in The Irish Independent.

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