Pantomime boy involved in a racket (7)
I believe the answer is:
aladdin
'pantomime' is the definition.
(I've seen this before)
'boy involved in a racket' is the wordplay.
'boy' becomes 'lad' (lad is a kind of boy).
'involved in' means one lot of letters goes inside another.
'racket' becomes 'din' (I've seen this before).
'a'+'din'='adin'
'lad' inserted within 'adin' is 'ALADDIN'.
(Other definitions for aladdin that I've seen before include "Pantomime set in China" , "pantomime role" , "Widow Twankey's son" , "Panto lamp rubber" , "Panto character with magic lamp (7)" .)