Issue good number (4)
I believe the answer is:
song
'number' is the definition.
(thesaurus)
'issue good' is the wordplay.
'issue' becomes 'son' (issue can mean someone's offspring**).
'good' becomes 'g' (abbreviation).
'son'+'g'='SONG'
(Other definitions for song that I've seen before include "Something recorded by 26 [FACES] , for example" , "Ballad, aria" , "Ditty" , "Musical number" , "Carol, for example" .)