Generally see supporting facilities? (7)
I believe the answer is:
loosely
'generally' is the definition.
('loosely' can be a synonym of 'generally')
'see supporting facilities?' is the wordplay.
'see' becomes 'ely' (example where cathedral located in diocese).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'facilities?' becomes 'loos' (loo is a kind of facility).
'ely' put after 'loos' is 'LOOSELY'.
(Other definitions for loosely that I've seen before include "Approximately" , "more or less" , "Vaguely" , "without restraint" , "Generally" .)