Are there any existing Trumpet and Clarinet duets? I would like to use one for solo and ensemble it would be a senior on clarinet and a junior on trumpet. If anybody has any suggestions I would appreciate it.

odd combo

but their both in Bb, so you could always use two trumpet parts - just have the clarinet play a trumpet part.

mhm, since they're the same key you can use a trumpet duet. trumpets have a less extensive range than clarinets have, which is why you should pick a trumpet duet as opposed to a clarinet duet.