One may write off nice LP (6)
I believe the answer is:
pencil
'one may write' is the definition.
I can't judge whether this definition defines the answer.
'off nice lp' is the wordplay.
'off' indicates an anagram.
'nice'+'lp'='nicelp'
'nicelp' anagrammed gives 'PENCIL'.
Can you help me to learn more?
(Other definitions for pencil that I've seen before include "Graphite writer" , "Wooden writer" , "Drawer with graphite in" , "Writing tool" , "Graphite stick" .)