Bird ascended, everyone having turned up (7)
I believe the answer is:
rosella
'bird' is the definition.
(I've seen this before)
'ascended everyone having turned up' is the wordplay.
'ascended' becomes 'rose' (I've seen this before).
'everyone' becomes 'all' (I've seen this before).
'having turned up' is a reversal indicator.
'all' backwards is 'lla'.
'rose'+'lla'='ROSELLA'
(Other definitions for rosella that I've seen before include "Aussie bird" , "Australian flyer" , "Parrot" , "Australian parakeet" .)