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' means to remove the middle letters (after the inside letters have vacated the word).
'getting' means one lot of letters go next to another.
'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" .)