Admit car being remodelled is exciting (8)
I believe the answer is:
dramatic
'exciting' is the definition.
(I know that dramatic is a more specific form of the attribute exciting)
'admit car being remodelled' is the wordplay.
'being remodelled' indicates anagramming the letters.
'admit'+'car'='admitcar'
'admitcar' with letters rearranged gives 'DRAMATIC'.
'is' is the link.
(Other definitions for dramatic that I've seen before include "Striking, impressive" , "Substantial" , "with eye-popping effect!" , "Sensational, theatrical" , "spectacular" .)