Worn after washing Barth novel with honour (8)
I believe the answer is:
bathrobe
'worn after washing' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
'barth novel with honour' is the wordplay.
'novel' indicates anagramming the letters.
'with' says to put letters next to each other.
'honour' becomes 'OBE' (Order of the British Empire award).
'barth' is an anagram of 'bathr'.
'bathr'+'obe'='BATHROBE'
Can you help me to learn more?
(Other definitions for bathrobe that I've seen before include "Towelling dressing-gown" , "Towelling dressing gown" , "Towelling garment" , "freshly-washed clothing" , "you may take it after a shower" .)