Answer: PDQ

AnswerCrossword Clue
PDQForerunner of Bach?
PDQAt once: Slang.
PDQQuickly: Slang.
PDQImmediately: Slang.
PDQPronto!
PDQPronto: Abbr.
PDQImmediately
PDQOn the double!
PDQForerunner of ASAP
PDQNow, if not sooner!
PDQRight away
PDQSchickele's Bach
PDQA.S.A.P.
PDQ"Stat!"
PDQInstantly, for short
PDQ[Snap snap]
PDQThree letters for "pronto."
PDQStraightaway
PDQWithout hesitation, in brief
PDQ"By yesterday"
PDQRelative of ASAP
PDQ"Right now"
PDQBogus Bach?
PDQ'At once!'
PDQ'Stat!'
PDQChop-chop
PDQThree letters that mean "now"
PDQASAP!
PDQAt once
PDQAt once briefly
PDQKin of ASAP
PDQKin of " stat"
PDQAlternative to ASAP
PDQOn the double
PDQLickety-split
PDQPromptly
PDQWithout delay
PDQPronto
PDQASAP relative
PDQASAP kin