Measure feeling of dread associated with memory that cannot be erased (8)
I believe the answer is:
angstrom
'measure feeling of dread associated with memory that cannot be erased' is the definition.
'angstrom' can be an answer for 'measure' (angstrom is a kind of measure). I'm not certain of the remainder of the definition.
'measure feeling of dread associated with' is the wordplay.
'measure' becomes 'rom' (I can't justify this - if you can you should give a lot more credence to this answer).
'feeling of dread' becomes 'angst' (I've seen this before).
'associated with' says to put letters next to each other.
'rom' after 'angst' is 'ANGSTROM'.
Can you help me to learn more?
(Other definitions for angstrom that I've seen before include "virtually no distance!" , "scientific unit" , "physicist" , "Unit in which light wavelengths are measured" , "Rabbit" .)