Crossword Genius

Building material firm, new, supported by Greek island (8)

Ross

I believe the answer is:

concrete

'building material' is the definition.
(concrete is a kind of building material)

'firm new supported by greek island' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'new' becomes 'n'.
'supported by' means one lot of letters go next to another (letters go below - in down clue).
'greek island' becomes 'crete' (I've seen this before).
'co'+'n'+'crete'='CONCRETE'

(Other definitions for concrete that I've seen before include "It's composed of sand, cement and water" , "Substantial, real" , "Unsightly building material" , "Building material - tangible" , "Not abstract or imaginary" .)

I've seen this clue in The Times.
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