Crossword Genius

Demonstrator being theatrical? (7)

Ross

I believe the answer is:

showman

I'm a little stuck... Click here to teach me more about this clue!

'theatrical?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'demonstrator being' is the wordplay.
'demonstrator' becomes 'show' (I can't justify this - if you can you should give a lot more credence to this answer).
'being' becomes 'man' (man is a kind of being).
'show'+'man'='SHOWMAN'

Can you help me to learn more?

(Other definitions for showman that I've seen before include "Circus or fair manager" , "Impresario" , "Person helping to present" , "Circus proprietor" , "Entertainer" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app