A small games enclosure (7)
I believe the answer is:
playpen
'a small games enclosure' is the definition.
'playpen' can be an answer for 'enclosure' (playpen is a kind of enclosure). I'm not certain of the 'a small games' bit.
'games enclosure' is the wordplay.
'games' becomes 'play' (I can't justify this - if you can you should give a lot more credence to this answer).
'enclosure' becomes 'pen' (pen is a kind of enclosure).
'play'+'pen'='PLAYPEN'
Can you help me to learn more?
(Other definitions for playpen that I've seen before include "device to capture the young" , "Limited room for amusement" , "juvenile restraint" , "Nipper stuck here" , "Portable enclosure for tots" .)