Fragile material goods woman kept in building wing (8)
I believe the answer is:
eggshell
'fragile material' is the definition.
'goods woman kept in building wing' is the wordplay.
'goods' becomes 'gg' (I've seen this in other clues).
'woman' becomes 'she'.
'kept in' indicates putting letters inside.
'building wing' becomes 'ell' (architectural term).
'gg'+'she'='ggshe'
'ggshe' inserted inside 'ell' is 'EGGSHELL'.
(Other definitions for eggshell that I've seen before include "formed in layers" , "Paint that dries with a sheen" , "destined to be cracked?" , "Thin (porcelain); shiny (paint)" , "made in Dorking?" .)