Yes, sort out molluscs (7)
I believe the answer is:
oysters
'molluscs' is the definition.
(oyster is a kind of mollusc)
'yes sort out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'yes'+'sort'='yessort'
'yessort' is an anagram of 'OYSTERS'.
(Other definitions for oysters that I've seen before include "Yet Ross finds these marine creatures" , "Fleshy bivalves, may yield pearls" , "Sources of pearls" , "Yet Ross, strangely, has the marine creatures" , "Tasty bivalves, may contain pearls" .)