Crossword clues for Once, a while back 4 lettersAnswerClueBACK___ to the FutureBACKDorsumBACKSupport with fundsBACKWith 118-Across, subject of an I.R.S. requestBACKQuarter, half or fullBACKBe an angel, on Broadway.BACKPull forBACKGet behindBACKWe go way ___BACKWord that can precede 17, 25, 50, 59-Across and 11, 37-DownBACKBehindBACKForth partnerBACKShirt holderBACKSpring forward, fall ___BACKMove __ and forthBACKDrive in reverse, with "up"BACKSupport in a causeBACK__ and forthBACK__ and forth (to and fro)BACKSecondBACKThe Empire Strikes ___BACKFootball manBACKFront's oppositeBACKNo longer on vacationBACKBrowser commandBACKGridiron yard-gainerBACKGive an endorsement toBACKWord cried after stay or comeBACKSupply funding forBACKType of seatBACKWith 4-Down, "Likewise, dude!"BACKBet onBACKProvide support forBACKBe an angelBACKSee 36-AcrossBACKBegin to parallel park, with "in"BACKLend support toBACKFurnish with fundsBACKGridiron runnerBACKEndorseBACKBrowser buttonBACKFootball positionBACKSafety, e.g.BACKWith 59 Down, a common miseryBACKLead-in to lash or logBACKSafety, for oneBACKMissing word in 21-, 31-, 40- and 50-Across, applied literallyBACKIn town againBACKWord with rest or slideBACKFill's partner.