Answer: GMT

AnswerCrossword Clue
GMTBBC World Service std.
GMTClock-setting standard (Abbr.)
GMTGreenwich time zone, briefly
GMTClock standard, briefly
GMTClock standard (Abbr.)
GMTGreenwich time zone
GMTPrime-meridian hrs.
GMTClock-setting standard: Abbr.
GMTBBC std.
GMTPrime meridian letters
GMTZero-deg. setting
GMTSetting for BBC reports, in brief
GMTCertain world std.
GMTStd. in chronometry
GMTClock setting at 0 degrees longitude: Abbr.
GMTChronometric std.
GMTIntl. standard
GMTFrequent abbr. in BBC announcements
GMTClock standard letters
GMTHrs. at the prime meridian
GMTZero-longitude hr.
GMTTime std.
GMTIt's often referenced in BBC news reports: Abbr.
GMTPrime meridian zone, briefly
GMTClock setting standard (Abbr.)
GMTLetters that clocks are set by
GMTClock setting at 0 degrees longitude (Abbr.)
GMTChronometric inits.
GMTStandard used to set zones, briefly
GMTTimes of London
GMTEnglish time: abbr.
GMTPrime Meridian letters
GMTLondon clock setting (Abbr.)
GMTAll clocks are set by it (Abbr.)
GMTEnglish time letters
GMTTime zone through England
GMTChronometric initials
GMTSetting in Eng.
GMTIntl. clock standard
GMTClock setting at zero long.