Answer: mussel

AnswerCrossword Clue
MUSSEL

Clam relative

MUSSEL

Shellfish

MUSSEL

Mollusk often served marinara

MUSSEL
Shellfish sometimes served with marinara sauce
MUSSEL
Mighty mollusk?
MUSSELShore dinner morsel
MUSSELFreshwater mollusk
MUSSELClam's cousin
MUSSELBivalve.
MUSSELShell fish.
MUSSELBivalve mollusk.
MUSSELSeafood item.
MUSSELMollusk delicacy
MUSSELFreshwater clam
MUSSELTidbit for Charles Atlas
MUSSELClam's relative
MUSSELA bivalve
MUSSELShore-dinner item
MUSSELGreek characters sell all but one piece of seafood (6)
MUSSELShellfish delicacy
MUSSELPaella ingredient, sometimes
MUSSELBouillabaisse ingredient, perhaps
MUSSELPaella ingredient
MUSSELStrophitus, for one
MUSSELMarine bivalve
MUSSELBouillabaisse ingredient