Pieces given regularly ere pierrot is performing (10)
I believe the answer is:
repertoire
'pieces given regularly' is the definition.
I can't judge whether this defines the answer.
'ere pierrot is performing' is the wordplay.
'is performing' is an anagram indicator (the letters move around or 'perform').
'ere'+'pierrot'='erepierrot'
'erepierrot' with letters rearranged gives 'REPERTOIRE'.
Can you help me to learn more?
(Other definitions for repertoire that I've seen before include "The pieces a performer can play" , "Performer's set of pieces played" , "stock" , "Range of skills or songs" , "Pieces a performer knows and plays" .)