Sad reminder from the war (6)
I believe the answer is:
wreath
'sad reminder' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'from the war' is the wordplay.
'from' is an anagram indicator (the anagram comes from the same letters).
'the'+'war'='thewar'
'thewar' with letters rearranged gives 'WREATH'.
Can you help me to learn more?
(Other definitions for wreath that I've seen before include "Flower arrangement" , "Floral tribute" , "The war (anag.)" , "26 Down may be shaped into this decorative ring" , "Circular band, of flowers say" .)