Unconscious, if sled crashes in playing areas (9)
I believe the answer is:
Here is my best explanation:
'playing areas' is the definition.
'unconscious if sled crashes' is the wordplay.
'unconscious' becomes 'out' ('out' can be similar in meaning to 'unconscious').
'crashes' is an anagram indicator.
'ifsled' anagrammed gives 'fields'.
'in' is the link.