Tag describing article found in English mine (7)
I believe the answer is:
epithet
'tag' is the definition.
(both can mean a nickname)
'article found in english mine' is the wordplay.
'article' becomes 'the' (the definite article in English).
'found in' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'mine' becomes 'pit' (down the pit).
'e'+'pit'='epit'
'the' put inside 'epit' is 'EPITHET'.
'describing' is the link.
(Other definitions for epithet that I've seen before include "Phrase expressing some quality of a person or thing" , "Fitting description" , "nickname" , "Descriptive term used to express a real quality" , "Word describing" .)