Allude, advert (5)
I believe the answer is:
refer
This clue is a double definition.
'allude' is the first definition.
(I've seen this before)
'advert' is the second definition.
(I know that advert can be written as refer)
(Other definitions for refer that I've seen before include "Advert, cite" , "Make allusion, or turn to for information" , "If special treatment needed, GP might do this" , "Pass" , "Direct elsewhere" .)