Question

The two waiters exchanged a look whose meaning was clear to me.

what type of clause or phase is used?
Ms. Sue
What is the clause? What kind to you think it is?

The sentence also has a prepositional phrase.
Robert
if i knew i would not ask
Robert
Please explain to me how to determine the answer im looking for
Ms. Sue
Study this carefully.

http://www.chompchomp.com/terms/clause.htm
Ms. Sue Would you Stop?
I mean seriously.. People are not here to learn, they are here for ANSWERS. Ugh..
Autumn
Im dead lmao
Please
Please look at the first example in her link. This is what you are.
Casta
OHHHHH, they told you!!!!
Sue is dumb
I was gonna tell a cripple joke but i cant stand those...
Emily Smitt
Adjective Clause