Create surface cover, set up and talk at length; vanish (9)
I believe the answer is:
evaporate
'vanish' is the definition.
(I've seen this before)
'create surface cover set up and talk at length' is the wordplay.
I cannot quite see how this works, but
'talk' could be 'orate' (orating is a kind of talking) and 'orate' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for evaporate that I've seen before include "Vaporise" , "Desiccate, dry up" , "Turn liquid to gas" , "Dissolve into the air" , "Turn from liquid to vapour" .)