Judge shower song (7)
I believe the answer is:
refrain
'song' is the definition.
(thesaurus)
'judge shower' is the wordplay.
'judge' becomes 'ref'.
'shower' becomes 'rain' (synonyms).
'ref'+'rain'='REFRAIN'
(Other definitions for refrain that I've seen before include "Lines repeated at the end of each verse" , "Much repeated saying" , "Abstain; chorus" , "The repeated lines at the end of verses" , "Recurring music to forbear from" .)