Dance queen popular with a dancer (9)
I believe the answer is:
ballerina
'dancer' is the definition.
(ballerina is a kind of dancer)
'dance queen popular with a' is the wordplay.
'dance' becomes 'ball' (ball is a kind of dance).
'queen' becomes 'ER' (short for Elizabeth Regina ie Queen Elizabeth).
'popular' becomes 'in' ('in' can mean trendy).
'with' means one lot of letters go next to another.
'ball'+'er'+'in'+'a'='BALLERINA'
(Other definitions for ballerina that I've seen before include "Danseuse" , "girl on point duty" , "She dances to a rain bell" , "Female dancer, could be prima" , "Female classical dancer" .)