They are on the same book. I have a great tenor player, but I do not have a clarinetist in the band, so I would have to bring another player in. Your question addresses a basic issue in playing Ellington's music with school ensembles. Many times, you will not have the precise instrumentation required, and the challenge is to be true to Ellington's compositional intent AND to make sure your band still gets the benefit of playing the music. In this specific case, I would not feature the tenor in that spot, for the following reason.
Good composers are very aware of the various registers of the instruments they right for.
When Ellington calls for a clarinet solo, it's as much of a need for an instrument in that precise instrumental range as it is for a clarinet. The tenor will be an octave too low for the backgrounds, and will change the entire message of that part of the piece. I would suggest a muted trumpet or a flute or something in the same general register as the clarinet. As for trying to find a spot for a tenor solo, that is a challenge with this year's lineup. Our school is on trimester and the effect has been to diminish the size and experience in my Jazz Band.