Roaming seashore on vacation, so try seafood (7)
I believe the answer is:
oysters
'seafood' is the definition.
(I know that oysters is a type of seafood)
'roaming seashore on vacation so try' is the wordplay.
'roaming' indicates anagramming the letters.
'on vacation' says to hollow out the word (remove centre letters).
'seashore' with its middle taken out is 'se'.
'se'+'so'+'try'='sesotry'
'sesotry' with letters rearranged gives 'OYSTERS'.
(Other definitions for oysters that I've seen before include "they get eaten by the dozen" , "Succulent bivales" , "Succulent bivalves, perhaps with pearls" , "Yet Ross finds these marine creatures" , "Yet Ross has these strange marine creatures" .)