There is art is playing one (5)
I believe the answer is:
sitar
'one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'there is art is playing' is the wordplay.
'there' becomes 'si' (I am not sure about this - if you are sure you should believe this answer much more).
'is playing' indicates an anagram.
'art' is an anagram of 'tar'.
'si'+'tar'='SITAR'
Can you help me to learn more?
(Other definitions for sitar that I've seen before include "Guitar-like instrument" , "It takes pluck" , "Indian musical instrument like long-necked lute" , "Lasting from morning to night" , "Large Indian lute" .)