Ghastly coat bear ripped (7)
I believe the answer is:
macabre
'ghastly' is the definition.
(synonyms)
'coat bear ripped' is the wordplay.
'coat' becomes 'mac' (mac is a kind of coat).
'ripped' is an anagram indicator (letters ripped or torn up).
'bear' anagrammed gives 'abre'.
'mac'+'abre'='MACABRE'
(Other definitions for macabre that I've seen before include "'Sinister, gruesome (7)'" , "Gruesome, morbid" , "gruesome result" , "Shockingly horrible" , "Gruesome and weird" .)