Survived topsy-turvy season - boards expelled! (9)
I believe the answer is:
outlasted
'survived' is the definition.
('outlast' can be a synonym of 'survive')
'topsy-turvy season boards expelled' is the wordplay.
'topsy turvy' says the letters should be written backwards.
'season' becomes 'salt' (salt can mean to season with salt).
'boards' indicates putting letters inside.
'expelled' becomes 'outed' (I've seen this in another clue).
'salt' in reverse letter order is 'tlas'.
'tlas' put within 'outed' is 'OUTLASTED'.
(Another definition for outlasted that I've seen is " Survived longer than".)