Deserts, maybe, but they’re usually green (6)
I believe the answer is:
leaves
'deserts' is the definition.
The answer and definition can be both related to thinking as well as being verbs in their -s form.
Maybe you can see a link between them that I can't see?
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for leaves that I've seen before include "Foliage - goes away" , "Rocket, for example" , "See 14" , "Doesn't eat" , "spinach for example" .)