The sentence "a true entertainer" is correct and can be used in written English. You might use it to describe someone who has the ability to entertain and amuse others, as in the following example: My friend is a true entertainer - he loves telling stories, doing magic tricks, and playing instruments.
Watching her at 68, rolling through one hit after another proved she's a true entertainer – and how can you not love someone who has more rhinestones than the whole of an Argos Elizabeth Duke collection?
A true entertainer.
After the incident will.i.am praised Lopez for being a true entertainer.
"That shows she's a true entertainer and devoted, She came out of it and still rocked it.
He's an artist and true entertainer who's definitely worth catching (and I'd recommend getting there early).
Why he rocks: Charles is a true renaissance entertainer, as I noted in a recent blogpost.
He is a genuine entertainer.
Thanks to Ludwig my first paper got accepted! The editor wrote me that my manuscript was well-written
Listya Utami K.
PhD Student in Biology, Bandung Institute of Technology, Indonesia