Answer: ADLIB

AnswerCrossword Clue
ADLIBStage surprise
ADLIBToss off a line
ADLIBDeviate from the script
ADLIBIgnore one's lines
ADLIBImprovised
ADLIBSurprise one's costar
ADLIBImprovise lines
ADLIBImprovise on stage
ADLIBWing it on stage
ADLIBGo off-script
ADLIBRobin Williams forte
ADLIBSpeak off the cuff
ADLIBSurprise during filming
ADLIBWing it, speechwise
ADLIBComment off the cuff
ADLIBEschew the cue cards
ADLIBSpeak sans script
ADLIBGroucho's specialty
ADLIBMake up on the stage
ADLIBSans-script quip
ADLIBOff-script remark
ADLIBGo off-book
ADLIBMake it up as you go
ADLIBOff-the-cuff
ADLIBExtemporize
ADLIBImprovise
ADLIBWing it
ADLIBRiff
ADLIBMake impromptu remarks
ADLIBFake it onstage
ADLIBGo off script
ADLIBDo some improv
ADLIBForm a line?
ADLIBAct rashly?
ADLIBUnrehearsed line
ADLIBIgnore the lines
ADLIBSans script
ADLIBThrow in a line
ADLIBBit of stage creativity
ADLIBIgnore the script