Fish pie inside duplicated (6)
I believe the answer is:
copied
'duplicated' is the definition.
The answer and definition can be both to do with creating things as well as being past participle verbs.
Maybe they are linked in a way I don't understand?
'fish pie inside' is the wordplay.
'fish' becomes 'cod' (type of fish).
'inside' indicates putting letters inside.
'cod' enclosing 'pie' is 'COPIED'.
Can you help me to learn more?
(Other definitions for copied that I've seen before include "Imitated or replicated" , "made a transcript" , "most sincerely flattered" , "Reproduced (something)" , "Imitated or recreated" .)