Blooming team! Not yet in! (7)
I believe the answer is:
outside
'not yet in' is the definition.
(not yet inside)
'blooming team' is the wordplay.
'blooming' becomes 'out' (plants which have bloomed are 'out').
'team' becomes 'side' (both can mean a sports team).
'out'+'side'='OUTSIDE'
(Other definitions for outside that I've seen before include "having emerged from the tunnel?" , "Unlikely" , "Tedious (anag)" , "Alfresco" , "External surface" .)