Non-English issue about to be packed for delivery (7)
I believe the answer is:
diction
'delivery' is the definition.
(I've seen this in other clues)
'non-english issue about to be packed' is the wordplay.
'non' suggests deleting specific letters.
'english' becomes 'e' (abbreviation).
'issue' becomes 'edition' (edition is a kind of issue).
'about' becomes 'c' (abbreviation for 'circa').
'to be packed' means one lot of letters goes inside another (some letters are packed into others).
'edition' with 'e' taken out is 'dition'.
'dition' enclosing 'c' is 'DICTION'.
'for' acts as a link.
(Other definitions for diction that I've seen before include "One's manner of speaking or pronouncing words" , "words for speech" , "Way of speaking or pronouncing" , "Mode of speech" , "Style of enunciation" .)