Surprisingly lucid, Arteta spoke coherently (11)
I believe the answer is:
articulated
'spoke coherently' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps you can see a link between them that I don't see?
'surprisingly lucid arteta' is the wordplay.
'surprisingly' indicates anagramming the letters (a surprising ordering of the letters).
'lucid'+'arteta'='lucidarteta'
'lucidarteta' with letters rearranged gives 'ARTICULATED'.
Can you help me to learn more?
(Other definitions for articulated that I've seen before include "Distinctly pronounced" , "Pronounced (words) clearly" , "suitable for express delivery primarily" , "Type of lorry" , "description of juggernaut" .)