signpost

Short definition from Wiktionary

Noun

1. 1
   A post bearing a sign that gives information on directions.
2. 2
   A word or phrase within a clue that serves as an indicator, rather than being fodder.

Verb

1. 1
   To install signposts on.
2. 2
   To direct (somebody) to services, resources, etc.
3. 3
   To indicate logical progress of a discourse using words or phrases such as now, right, to recap, to sum up, as I was saying, etc.
4. 4
   To signal, as if with a signpost.