Gamer isn't prepared for being on Twitch? (9)
I believe the answer is:
streaming
'being on twitch?' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'gamer isn't prepared' is the wordplay.
'prepared' is an anagram indicator.
'gamer'+'isnt'='gamerisnt'
'gamerisnt' anagrammed gives 'STREAMING'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for streaming that I've seen before include "Way of classifying the children" , "moving en masse" , "going in large quantities" .)