Male libertine on vacation getting seafood (6)
I believe the answer is:
cockle
'seafood' is the definition.
(cockle is a kind of seafood)
'male libertine on vacation getting' is the wordplay.
'male' becomes 'cock' (male chicken).
'on vacation' suggests removing the centre (after the inside letters have vacated the word).
'getting' says to put letters next to each other.
'libertine' with its centre removed is 'le'.
'cock'+'le'='COCKLE'
(Other definitions for cockle that I've seen before include "Shellfish" , "Seafood item" , "Common edible bivalve" , "occupant of shell" , "Mollusc - cornfield weed" .)