Ensure one has a nap standing up (5)
I believe the answer is:
tease
'ensure' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for tease that I've seen before include "Rib, wind up" , "Rib, annoy" , "Torment for fun" , "Cod" , "Make fun of; comb wool" .)