Support for driver re deaths in a crash (8)
I believe the answer is:
headrest
'support for driver' is the definition.
're deaths in a crash' is the wordplay.
'in a crash' indicates anagramming the letters.
're'+'deaths'='redeaths'
'redeaths' is an anagram of 'HEADREST'.
(Other definitions for headrest that I've seen before include "With capital support" , "Support on car seat" , "What may reduce whiplash" , "support to chairman?" , "Capital supporter" .)