Turned bee into rubber (7)
I believe the answer is:
ebonite
'rubber' is the definition.
(ebonite is a kind of rubber)
'turned bee into' is the wordplay.
'turned' is an anagram indicator.
'bee'+'into'='beeinto'
'beeinto' is an anagram of 'EBONITE'.
(Other definitions for ebonite that I've seen before include "Bee on it (anag.)" , "Vulcanite" , "something rubbery" , "Rubbery material" , "vulcanised rubber" .)