Deadpool, possibly naked, about to recover of course (9)
I believe the answer is:
naturally
'of course' is the definition.
(synonyms)
'deadpool possibly naked about to recover' is the wordplay.
I cannot really understand how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is found in the answer.
'recover' could be 'rally' (rallying is a kind of recovering) and 'rally' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for naturally that I've seen before include "In an artless way" , "without medicine" , "as you might expect" , "Unforced" , "it goes without saying" .)