Went back to be in Paris, having graded accommodation (9)
I believe the answer is:
retreated
'went back' is the definition.
('retreat' can be a synonym of 'go back')
'be in paris having graded accommodation' is the wordplay.
I cannot really understand how this works, but
'be in paris' could be 'etre' (I've seen this in another clue) and 'etre' is located in the answer.
'graded' could be 'rated' ('rate' can be a synonym of 'grade') and 'rated' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'to' acts as a link.
Can you help me to learn more?
(Other definitions for retreated that I've seen before include "Withdrew from enemy forces" , "Gave up ground" , "Retired" , "given extra medical care?" , "pulled back" .)