Crossword clues for The "S" in 54-Down 3 letters:AGS54 Down and others, brieflyAPE54-Down's ancestorCAR___ 54, Where Are You?SKIGet off the 54-DownETA54-Across posting: Abbr.ARTSee 54 Across^ARKOIJapanese 54-DownJETYou might be on one if you do the starts of 20-, 37- and 54-AcrossSHE54-Across pronounTUB54-Across holderSIS54-Across' sibEAUSee 54 DownLTS54 Down officersHAMPartner of 54 DownBENSee 54 DownARTWith 54 Across, Jazz Age styleBONWith 54-Down, some cracksMITSch. whose three initials have longer abbreviated forms hidden in 20, 37 and 54 AcrossXERSee 54-AcrossALEDrink that's an anagram of 54-DownLIVWoman whose lucky number might be 54?ATEPast and anagram of 54-DownMVPYogi Berra, in '51, '54, and '55UFOArea 54 craftIANSchrager who co-founded Studio 54YDSStat for 54-DownLIVWoman who's 54?DAI___ Burger, rapper with the 2014 mixtape "In Ya Mouf!" (hint: looks like a singular form of 54-Down)STEBus. address that's an anagram of 54-DownIKE54 Across, familiarlySSTBig bird hidden in 17-, 22-, 33-, 46- and 54-AcrossEWE54-Down mateEPIWith 54-across, anaphylaxis-treatment deviceIDOBrief 54-DownNOR54-Down's home: Abbr.KEN54-year-old dollOUTSee 54-AcrossBOBShort haircut, and a hint to 17-, 25-, 43- and 54-AcrossLAT54°40', e.g.: Abbr.CAR54, for oneOPSMother of 54-AcrossONESee 54-AcrossORR54 Down greatRAESee 54 AcrossNORCharter 54 Down memberNOTSee 54 DownSAMLiterary sidekick introduced in '54LIV54, in old RomeBROCounterpart of 54 DownNEE54-Across, in French