Library patron (6)
I believe the answer is:
'library patron' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for reader that I've seen before include "Interpreter of what is written" , "Times subscriber, perhaps?" , "member of the university" , "Text book -- red ear (anag)" , "Kind of textbook - or its peruser" .)