Clue describing pit? (3-3)
I believe the answer is:
tip-off
This clue could be a double definition.
'clue' is the first definition.
(thesaurus)
'pit?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'describing' is the link.
(Other definitions for tip-off that I've seen before include "Piece of secret information" , "Warn in advance" , "Informed hint" , "Give a secret warning" , "Give advance warning or hint" .)