Like granite or wooden surface scrubbed (7)
I believe the answer is:
igneous
'like granite' is the definition.
'wooden surface scrubbed' is the wordplay.
'wooden' becomes 'ligneous' (I've seen this before).
'surface scrubbed' means to remove the first letter.
'ligneous' with its initial letter taken off is 'IGNEOUS'.
'or' acts as a link.
(Other definitions for igneous that I've seen before include "Maybe fiery" , "(Of rock) solidified from lava or magma" , "Originally molten (rock)" , "Produced by intense heat, rocks say" , "Like fire - type of rock" .)