The writer with dictionary encompassing translation of Chinese — there’s improving stuff here (8,5)
I believe the answer is:
medicine chest
'there's improving stuff here' is the definition.
(container of drugs for improving one's health)
'the writer with dictionary encompassing translation of chinese' is the wordplay.
'the writer' becomes 'me' (the person who is writing these clues).
'with' means one lot of letters go next to another.
'dictionary' becomes 'dict'.
'encompassing' indicates putting letters inside.
'translation of' indicates anagramming the letters (I've seen this in other clues).
'chinese' is an anagram of 'ineches'.
'dict' placed around 'ineches' is 'dicinechest'.
'me'+'dicinechest'='MEDICINE-CHEST'
(Other definitions for medicine chest that I've seen before include "Box of remedies" , "First-aid box" .)