A top duet being played is current (2-2-4)
I believe the answer is:
up-to-date
'is current' is the definition.
('up-to-date' can be similar in meaning to 'current')
'a top duet being played' is the wordplay.
'being played' is an anagram indicator.
'a'+'top'+'duet'='atopduet'
'atopduet' anagrammed gives 'UP-TO-DATE'.
(Other definitions for up-to-date that I've seen before include "Reflecting the latest information" , "In accordance with the most fashionable style" , "Aware of the latest" , "To the present time" , "Thoroughly modern" .)