
1) Ad-lib 2) Be a make-up artist 3) Do make-up work 4) Do with whatever is at hand 5) Execute 6) Extemporise 7) Extemporize 8) French word used in English 9) Improvize 10) Manage in a makeshift way 11) Not follow the book 12) Perform 13) Perform without preparation
Found on
https://www.crosswordclues.com/clue/improvise

1) Ad-lib 2) Extemporise 3) Extemporize 4) Fake it 5) Improvize 6) Make do 7) Noodle 8) Play it by ear 9) Vamp 10) Wing it
Found on
https://www.crosswordclues.com/clue/improvise

• (v. t.) To compose, recite, or sing extemporaneously, especially in verse; to extemporize; also, to play upon an instrument, or to act, extemporaneously. • (v. t.) To bring about, arrange, or make, on a sudden, or without previous preparation. • (v. i.) To produce or render extemporaneous compositions, especially in verse or in mus...
Found on
http://thinkexist.com/dictionary/meaning/improvise/

Impromptu acting. A technique for allowing performers to access their own creativity and give them an allowance for making up their own lines. Without a script in hand or rehearsal of any kind, a dry-run so to speak, the improvisation of performers often lends itself to spontaneity and and into their own feelings for a more responsive scene
Found on
http://www.allmovie.com/glossary/term/improvise

Im`pro·vise' transitive verb [ imperfect & past participle Improvised ; present participle & verbal noun Improvising .] [ French improviser , it. improvvisare , from improvviso unprovided, sudden, extempore, Latin
Found on
http://www.encyclo.co.uk/webster/I/25

[
v] - manage in a makeshift way 2. [v] - perform without preparation
Found on
http://www.webdictionary.co.uk/definition.php?query=improvise

to create music spontaneously.
Found on
https://education.ket.org/resources/music-glossary/
improvize verb perform without preparation; `he extemporized a speech at the wedding`
Found on
https://www.encyclo.co.uk/local/20974

to invent music spontaneously while playing - If you want to be a jazz musician, you have to learn how to improvise.
Found on
https://www.englishclub.com/vocabulary/music-vocabulary.htm
No exact match found.