Crossword Genius

Clue describing pit? (3-3)

Ross

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" .)

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