Performer, one who’s rational about one in court (10)

'performer' is the definition.
(I know that recitalist is a type of soloist)

'one who's rational about one in court' is the wordplay.
'one who's rational' becomes 'realist' (a realist is rational or practical).
'about' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'in' is an insertion indicator.
'court' becomes 'ct' (abbreviation used in road names).
'i' placed inside 'ct' is 'cit'.
'realist' placed around 'cit' is 'RECITALIST'.