Seafood concession welcoming visit (7)
I believe the answer is:
scallop
'seafood' is the definition.
(scallop is a kind of seafood)
'concession welcoming visit' is the wordplay.
'concession' becomes 'sop' (sop is a kind of concession).
'welcoming' is an insertion indicator (in sense of 'inviting in').
'visit' becomes 'call' ('call' can be a synonym of 'visit').
'sop' placed around 'call' is 'SCALLOP'.
(Other definitions for scallop that I've seen before include "Marine mollusc" , "Edible bivalve mollusc" , "Shellfish - pilgrim badge" , "Shell - sign of a pilgrim" , "Shapely dish" .)