Unfortunately, morgues are ultimately — this? (8)
I believe the answer is:
gruesome
'this?' is the definition.
The answer and definition are not the same part of speech.
'unfortunately morgues are ultimately' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'ultimately' says to take the final letters.
The last letter of 'are' is 'e'.
'morgues' with letters rearranged gives 'gruesom'.
'gruesom'+'e'='GRUESOME'
Can you help me to learn more?
(Other definitions for gruesome that I've seen before include "Repulsive, horrific" , "Horrifying and revolting" , "'Ghastly, grisly (8)'" , "Repulsive, horrid" , "Causing horror or repulsion" .)