Type of marble style in corridor (8)
I believe the answer is:
alleyway
'corridor' is the definition.
(I've seen this before)
'type of marble style' is the wordplay.
'type of marble' becomes 'alley' (a marble made of alabaster).
'style' becomes 'way' (synonyms).
'alley'+'way'='ALLEYWAY'
'in' acts as a link.
(Other definitions for alleyway that I've seen before include "Small passage" , "narrow lane" , "Path between buildings" , "Narrow passage" , "Corridor" .)