Article based on paper is plagiarism? (5)
I believe the answer is:
theft
'is plagiarism?' is the definition.
(I've seen this in another clue)
'article based on paper' is the wordplay.
'article' becomes 'the' (the definite article).
'based on' means one lot of letters go next to another.
'paper' becomes 'ft' (Financial Times newspaper).
'the'+'ft'='THEFT'
(Other definitions for theft that I've seen before include "Taking of another's property" , "Taking offence?" , "Pilfering" , "Misappropriation" , "Burglary" .)