It is clear playing is natural (9)
I believe the answer is:
realistic
'natural' is the definition.
(thesaurus)
'it is clear playing' is the wordplay.
'playing' indicates an anagram.
'it'+'is'+'clear'='itisclear'
'itisclear' anagrammed gives 'REALISTIC'.
'is' acts as a link.
(Other definitions for realistic that I've seen before include "Objective" , "believable" , "Down-to-earth" , "Pragmatic" , "true-to-life" .)