Crossword Genius

Possibly blast a rock (6)

Ross

I believe the answer is:

basalt

'rock' is the definition.
(I know that basalt is a type of volcanic rock)

'possibly blast a' is the wordplay.
'possibly' is an anagram indicator.
'blast'+'a'='blasta'
'blasta' anagrammed gives 'BASALT'.

(Other definitions for basalt that I've seen before include "Dark rock of volcanic origin" , "Rock containing olivine" , "Commonest type of solidified lava; dense, dark grey and fine-grained" , "Black volcanic rock" , "rock from 2 [VOLCANO]" .)

I've seen this clue in the Evening Standard.
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