One more article not for the missus (7)
I believe the answer is:
another
'one more' is the definition.
(I've seen this before)
'article not for the missus' is the wordplay.
'article' becomes 'a' (example of the part-of-speech).
'for' is a charade indicator (letters next to each other).
'the missus' becomes 'her' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'not'+'her'='ANOTHER'
Can you help me to learn more?
(Other definitions for another that I've seen before include "A different (thing)" , "Somebody else" , "second" , "encore?" , "Additional, one more" .)