Sort of rubber star wears still wet in odd places (8)
I believe the answer is:
silicone
'sort of rubber' is the definition.
'star wears still wet in odd places' is the wordplay.
'star' becomes 'icon' ().
'wears' indicates putting letters inside.
'in odd places' means one should take alternating letters (only odd-numbered letters).
'still'+'wet'='stillwet'
The alternating letters of 'stillwet' are 'sile'.
'icon' going within 'sile' is 'SILICONE'.
(Other definitions for silicone that I've seen before include "It's used in, say, synthetic rubber" , "Isocline (anag.)" , "Valley" , "Polymer used in paints and implants, say" , "What's used in breast implants" .)