Answer: adlib

AnswerCrossword Clue
ADLIB

Do some improv

ADLIB

Make it up as you go

ADLIB

Off-the-cuff

ADLIB
Extemporize
ADLIB
Improvise
ADLIBWing it
ADLIBRiff
ADLIBMake impromptu remarks
ADLIBFake it onstage
ADLIBGo off script
ADLIBGo off-book
ADLIBForm a line?
ADLIBAct rashly?
ADLIBUnrehearsed line
ADLIBIgnore the lines
ADLIBSans script
ADLIBThrow in a line
ADLIBBit of stage creativity
ADLIBIgnore the script
ADLIBLine not in the script
ADLIBSpeak off the cuff
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
ADLIBStage surprise
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