Refer to everything with due variety (6)
I believe the answer is:
allude
'refer to' is the definition.
(I've seen this in another clue)
'everything with due variety' is the wordplay.
'everything' becomes 'all' (all things).
'with' is a charade indicator (letters next to each other).
'variety' indicates an anagram.
'due' with letters rearranged gives 'ude'.
'all'+'ude'='ALLUDE'
(Other definitions for allude that I've seen before include "Refer obliquely" , "Make reference to in passing" , "Speak about in passing" , "Make indirect reference (to)" , "give a reference" .)