One delivering bulletin as reward seen stumbling (10)
I believe the answer is:
newsreader
'one delivering bulletin' is the definition.
The definition suggests a singular noun which matches the answer.
'reward seen stumbling' is the wordplay.
'stumbling' is an anagram indicator.
'reward'+'seen'='rewardseen'
'rewardseen' with letters rearranged gives 'NEWSREADER'.
'as' is the link.
Can you help me to learn more?
(Other definitions for newsreader that I've seen before include "TV current affairs presenter" , "TV employee" , "Presenter of bulletin" , "Bulletin broadcaster" .)