There is a total of 169 clues beginning with x-
- X- --
- X- or Blu- follower
- X- or y- in geometry
- X-15 may be the first
- X-15
- X-Acto knife cut
- X-Acto knife cut, perhaps
- X-Acto parent company
- X-and-O game show
- X-axis
- X-axis coordinate
- X-box setting?
- X-coordinate
- X-coordinate of a point
- X-coordinates, in math
- X-ed
- X-ed out price?
- X-ed out?
- X-ed, perhaps
- X-file examiners
- X-File subj
- X-File subject
- X-Files agent
- X-Files creator Carter
- X-files descriptor
- X-files subjects, briefly
- X-files subjects, for short
- X-Flles org
- X-Games airer
- X-Games bike, briefly
- X-Games motorcycle race
- X-Games network
- X-Games telecaster
- X-II
- X-like Greek letter
- X-Men adversary who wears a flamethrower
- X-Men co-creator Lee
- X-Men co-creator Stan
- X-Men creator Lee
- X-Men enemy who can control fire
- X-Men villain
- X-movie ingredient
- X-O-X line in tic-tac-toe, eg
- X-quantities to be solved
- X-rated
- X-rated maybe
- X-rated dance
- X-rated exhibition
- X-rated film director's take?
- X-rated film, informally
- X-rated flick
- X-rated language
- X-rated literature
- X-rated Lovelace
- X-rated material
- X-rated movie material
- X-rated movies
- X-rated performance
- X-rated reading
- X-rated stuff
- X-rated words
- X-rated works
- X-rated, perhaps
- X-rated, say
- X-rated, usually
- X-rating?
- X-ray
- X-ray -- (sci-fi glasses)
- X-ray alternative
- X-ray alternative, maybe
- X-ray alternatives
- X-ray blocker
- X-ray cousin
- X-ray cousin, briefly
- X-ray descendant
- X-ray disclosure
- X-ray discoverer
- X-ray dosage unit
- X-ray dosage units
- X-ray dosages
- X-ray dose
- X-ray dose unit
- X-ray dose units
- X-ray doses
- X-ray examiner, perhaps
- X-ray examiners: Abbr
- X-ray exposure units
- X-ray follow-up
- X-ray follow-up, perhaps
- X-ray follow-up, sometimes
- X-ray for Rex, say
- X-ray imaging technique
- X-ray kin
- X-ray machine is one
- X-ray machines, eg
- X-ray man
- X-ray measurements
- X-ray objects sometimes
- X-ray of the hips feature
- X-ray particle