Upgrade level for those attending (5)
I believe the answer is:
raise
'upgrade' is the definition.
(both can mean to promote or improve)
'level for those attending' is the wordplay.
I cannot really see how this works, but
'level' could be 'a' (A level is an example) and 'a' is present in the answer.
The remaining letters 'rise' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for raise that I've seen before include "Bring up - an increase in pay" , "Hoist" , "better?" , "Haul up" , "jack up" .)