Displays reason for playing area (6,6)
I believe the answer is:
sports ground
'playing area' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'displays reason' is the wordplay.
'displays' becomes 'sports' (I can't justify this - if you can you should believe this answer much more).
'reason' becomes 'ground' (synonyms).
'sports'+'ground'='SPORTS GROUND'
'for' acts as a link.
Can you help me to learn more?
(Another definition for sports ground that I've seen is " Place for athletics, say".)