English mine with the odd descriptive term (7)
I believe the answer is:
epithet
'descriptive term' is the definition.
(I've seen this before)
'english mine with the odd' is the wordplay.
'english' becomes 'e' (abbreviation).
'mine' becomes 'pit' (down the pit).
'with' says to put letters next to each other.
'odd' indicates an anagram.
'the' anagrammed gives 'het'.
'e'+'pit'+'het'='EPITHET'
(Other definitions for epithet that I've seen before include "nickname" , "Adjective expressing some quality of a person" , "Sobriquet" , "Descriptive work or phrase" , "Word describing" .)