Verne novel featuring Nemo's second appearance (6)
I believe the answer is:
veneer
'appearance' is the definition.
(I've seen this before)
'verne novel featuring nemo's second' is the wordplay.
'novel' is an anagram indicator.
'featuring' indicates putting letters inside.
'nemo's second' becomes 'e' (I am not sure about this - if you are sure you should believe this answer much more).
'verne' with letters rearranged gives 'vener'.
'vener' enclosing 'e' is 'VENEER'.
Can you help me to learn more?
(Other definitions for veneer that I've seen before include "Thin wood facade" , "A thin layer on the surface, often wood" , "Thin wooden facing" , "Superficial veneer" , "Specious outward appearance of good quality" .)