Docked mine over off-colour infringement of copyright (6)
I believe the answer is:
piracy
'infringement of copyright' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'docked mine over off-colour' is the wordplay.
'docked' means to remove the last letter (to dock can mean to remove the tail of an animal).
'mine' becomes 'pit' (down the pit).
'over off colour' becomes 'racy' (I am not sure about this - if you are sure you should believe this answer much more).
'pit' with its final letter taken away is 'pi'.
'pi'+'racy'='PIRACY'
Can you help me to learn more?
(Other definitions for piracy that I've seen before include "Buccaneering" , "Maritime or commercial robbery" , "Act of plagiarism" , "Robbery on the high seas" , "Robbing of ships at sea" .)