Bag of nuts (7)
I believe the answer is:
scrotum
I believe this clue is a double definition.
'bag' is the first definition.
(thesaurus)
'nuts' is the second definition.
(thesaurus)
'of' acts as a link.
(Other definitions for scrotum that I've seen before include "Wrinkled retainer" , "man's bag" , "manbag?" .)