Part of a watch (4)
(Other definitions for dial that I've seen before include "Watch face" , "Clock face" , "Meter face" , "Face of a timepiece" , "Indicator" .)
(Other definitions for face that I've seen before include "well-known person" , "TV show" , "Watch's dial" , "'Cheeks, mouth, eyes etc (4)'" , "Countenance, visage" .)