Preferably (6)
'preferably' is the definition.
(I know that preferably can be written as rather)
This is all the clue.
(Other definitions for rather that I've seen before include "To a limited degree" , "Pretty" , "Quite; on the contrary" , "Prefer" , "Infinite time" .)
'preferably' is the definition.
(eg 'I'd sooner sit' means 'I would prefer to sit')
This is all the clue.
(Other definitions for sooner that I've seen before include "nickname of US State" , "Earlier or preferably" , "More readily; earlier" , "native of Oklahoma" , "Earlier than previously thought" .)