Nudes frolicking in a river -- separately (7)
I believe the answer is:
asunder
'separately' is the definition.
(thesaurus)
'nudes frolicking in a river' is the wordplay.
'frolicking' indicates an anagram.
'in' indicates putting letters inside.
'river' becomes 'r'.
'nudes' anagrammed gives 'sunde'.
'a'+'r'='ar'
'sunde' put into 'ar' is 'ASUNDER'.
(Other definitions for asunder that I've seen before include "(Split) into pieces" , "(Broken) apart" , "(Torn) into parts" , "Sad rune (anag.)" , "Apart - in pieces" .)