Fresh openings for a number of traditional singers (12)
I believe the answer is:
greensleeves
'a number of traditional singers' is the definition.
(musical number, traditional song)
'fresh openings' is the wordplay.
'fresh' becomes 'green' (I've seen this before).
'openings' becomes 'sleeves' (openings in an item of clothing).
'green'+'sleeves'='GREENSLEEVES'
'for' acts as a link.
(Other definitions for greensleeves that I've seen before include "Traditional Elizabethan folk tune and ballad" , ""My lady" of old folk song" , "Brownshirts would never display such" , "English folk song (not composed by Henry VIII!)" , "that might be noticed when lying on the lawn" .)