Performing a play, say Crossword Clue

 The answer to the performing a play, say crossword clue is ACTING.

The word "acting" can mean to perform in a play or other theatrical production. It can also mean to pretend to be someone or something that you are not.

Here are some other words that can be used to describe someone who is performing in a play:

Thespian

Actor

Actress

Performer

Troubadour

Minstrel

Comedian

Entertainer

Ventriloquist

Puppeteer

I hope this helps!