Wrongly take article, one acquired on memorable day (6)
I believe the answer is:
thieve
'wrongly take' is the definition.
'thieve' can be an answer for 'take' (thieving is a kind of taking). I am unsure of the 'wrongly' bit.
'article one acquired on memorable day' is the wordplay.
'article' becomes 'the' (the definite article).
'one' becomes 'i' (Roman numeral).
'acquired' is an insertion indicator (inserted letters are acquired by another word).
'on memorable day' becomes 've' (I am not sure about this - if you are sure you should believe this answer much more).
'the' enclosing 'i' is 'thie'.
'thie'+'ve'='THIEVE'
Can you help me to learn more?
(Other definitions for thieve that I've seen before include "Misappropriate" , "Take illegally" , "Nick things" , "appropriate" , "Steal things" .)