Strange article used in performance (7)
I believe the answer is:
recital
'performance' is the definition.
(recital is a kind of performance)
'strange article' is the wordplay.
'strange' indicates anagramming the letters.
'article' anagrammed gives 'RECITAL'.
'used in' acts as a link.
(Other definitions for recital that I've seen before include "Public musical performance" , "Musical entertainment or a long account" , "Verbal account" , "statement of facts" , "Concert by soloist" .)