Average – means (6)
I believe the answer is:
medium
I believe this clue is a double definition.
'average' is the first definition.
(I know that average can be written as medium)
'means' is the second definition.
(medium is a kind of means)
(Other definitions for medium that I've seen before include "Spirits of dead people are said to communicate through one" , "Average, mean" , "Middle course for participator in seance" , "TV, say" , "Psychic; average" .)