Half of everything in season (4)
I believe the answer is:
fall
'season' is the definition.
(fall is a kind of season)
'half of everything' is the wordplay.
'half' indicates taking half.
'everything' becomes 'all' (I've seen this before).
'of' halved is 'f'.
'f'+'all'='FALL'
'in' acts as a link.
(Other definitions for fall that I've seen before include "Autumn in America" , "Descend, drop" , "Quarrel" , "subside" , "Trip over - flag" .)