Glass is raised by detective in Scottish town (8)
I believe the answer is:
obsidian
'glass' is the definition.
(I've seen this before)
'is raised by detective in scottish town' is the wordplay.
'raised by' is a reversal indicator.
'detective' becomes 'di' (Detective Inspector abbreviation).
'in' indicates putting letters inside.
'scottish town' becomes 'oban' (I've seen this before).
'is' written backwards gives 'si'.
'si'+'di'='sidi'
'sidi' inserted inside 'oban' is 'OBSIDIAN'.
(Other definitions for obsidian that I've seen before include "Dark glass-like rock" , "Dark volcanic rock" , "Glassy black igneous rock" , "Volcanic glass-like rock" , "Glass bottle may be in this" .)