If you've never been another profession other then Ent, when you respec you'll need to grind up as if you had just started that profession. This is for any situation where you're respecing to a different profession type (there are 3, Combat, Entertainer and Crafter) which you've never been. However, if you ever decided you wanted to go back to Entertainer you'd again be level 90, likewise if you respeced again from entertainer back to the other profession type (doesn't need to be the exact same profession, just in the same type) it'd remember the level you were for that as well.
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If you've never been another profession other then Ent, when you respec you'll need to grind up as if you had just started that profession. This is for any situation where you're respecing to a different profession type (there are 3, Combat, Entertainer and Crafter) which you've never been. However, if you ever decided you wanted to go back to Entertainer you'd again be level 90, likewise if you respeced again from entertainer back to the other profession type (doesn't need to be the exact same profession, just in the same type) it'd remember the level you were for that as well.