There appears good reason to have fun here (10)
I believe the answer is:
fairground
'there appears good reason to have fun here' is the definition.
The answer is a location as well as being a singular noun. This is suggested by the definition.
'reason to have fun here' is the wordplay.
'reason' becomes 'ground' ('ground' can be a synonym of 'reason').
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'have fun here' becomes 'fair' (I can't justify this - if you can you should give a lot more credence to this answer).
'ground' after 'fair' is 'FAIRGROUND'.
Can you help me to learn more?
(Other definitions for fairground that I've seen before include "that holds attractions" , "rides here" , "Entertainment centre" , "Scary ride here perhaps" , "Entertainment venue" .)