Hint at, with "to" (6)
I believe the answer is:
allude
'hint at with to' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for allude that I've seen before include "Mention in passing" , "advert" , "give a reference" , "Make indirect reference (to)" , "Suggest or call attention to indirectly" .)