Now opening for a season (6)
I believe the answer is:
advent
'a season' is the definition.
(Advent is an example)
'now opening' is the wordplay.
'now' becomes 'ad' (I've seen this in other clues).
'opening' becomes 'vent' (vent is a kind of opening**).
'ad'+'vent'='ADVENT'
'for' acts as a link.
(Other definitions for advent that I've seen before include "Arrival (with calendar?)" , "Arrival of important person or event" , "sort of calendar" , "Period in the Christian calendar" , "Coming - occasion in Church calendar" .)