A listening figure (3)
I believe the answer is:
ten
'figure' is the definition.
(ten is a number)
'a listening' is the wordplay.
'TEN' is hidden in amongst the letters.
However, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for ten that I've seen before include "Roman numeral X" , "Figure" , "Five times two" , "time" , "Half a score" .)