Crossword hint (4)
I believe the answer is:
clue
'crossword hint' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for clue that I've seen before include "One of twenty-four in this puzzle" , "Crossword help" , "Crossword hint?" , "crossword guide" , "one of 28 here" .)