Ghastly car with beam adjusted (7)
I believe the answer is:
macabre
'ghastly' is the definition.
(synonyms)
'car with beam adjusted' is the wordplay.
'with' is a charade indicator (letters next to each other).
'adjusted' indicates an anagram.
'car' after 'beam' is 'beamcar'.
'beamcar' is an anagram of 'MACABRE'.
(Other definitions for macabre that I've seen before include "Grotesque" , "Brace ma, being gruesome" , "Ghostly appearance" , "Morbidly repellent" , "Gruesome, suggesting death" .)