% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Once, a while back 4 letters

AnswerClue
BACK___ to the Future
BACKDorsum
BACKSupport with funds
BACKWith 118-Across, subject of an I.R.S. request
BACKQuarter, half or full
BACKBe an angel, on Broadway.
BACKPull for
BACKGet behind
BACKWe go way ___
BACKWord that can precede 17, 25, 50, 59-Across and 11, 37-Down
BACKBehind
BACKForth partner
BACKShirt holder
BACKSpring forward, fall ___
BACKMove __ and forth
BACKDrive in reverse, with "up"
BACKSupport in a cause
BACK__ and forth
BACK__ and forth (to and fro)
BACKSecond
BACKThe Empire Strikes ___
BACKFootball man
BACKFront's opposite
BACKNo longer on vacation
BACKBrowser command
BACKGridiron yard-gainer
BACKGive an endorsement to
BACKWord cried after stay or come
BACKSupply funding for
BACKType of seat
BACKWith 4-Down, "Likewise, dude!"
BACKBet on
BACKProvide support for
BACKBe an angel
BACKSee 36-Across
BACKBegin to parallel park, with "in"
BACKLend support to
BACKFurnish with funds
BACKGridiron runner
BACKEndorse
BACKBrowser button
BACKFootball position
BACKSafety, e.g.
BACKWith 59 Down, a common misery
BACKLead-in to lash or log
BACKSafety, for one
BACKMissing word in 21-, 31-, 40- and 50-Across, applied literally
BACKIn town again
BACKWord with rest or slide
BACKFill's partner.