Obtained an article from Billy or Nanny (3)
I believe the answer is:
got
'obtained' is the definition.
('get' can be a synonym of 'obtain')
'an article from billy or nanny' is the wordplay.
'an article' becomes 'a' (the indefinite article in English).
'from' is a deletion indicator.
'billy or nanny' becomes 'go at' (I've seen this in another clue).
'goat' with 'a' removed is 'GOT'.
(Other definitions for got that I've seen before include "Landed" , "came by" , "Acquired" , "Obtained" , "Received; understood" .)