tóu​xù

clue

头绪 (頭緒) tóu​xù
clue noun
the main threads or a lead that helps in understanding a complex matter

After some investigation, there is finally a lead in this case.

outline noun
the general order, sequence, or systematic organization of thoughts or affairs

My thoughts are a mess; I can't make head or tail of it for the moment.

Frequency

Movie subtitles
11.6 per million appears in 6% of films
Written text
1.88 per million

Sources

Definitions
CC-CEDICT