Spineless individual, American, about to follow associate of Capone? (7)

I believe the answer is:
mollusc
'follow associate of capone?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'spineless individual american about' is the wordplay.
'spineless individual' becomes 'moll' (moll is a kind of individual. I am not sure about the 'spineless' bit.).
'american' becomes 'US' (United States).
'about' becomes 'c' (circa).
'moll'+'us'+'c'='MOLLUSC'
'to' is the link.
Can you help me to learn more?
(Other definitions for mollusc that I've seen before include "Shelled invertebrate" , "slug, perhaps" , "Creature such as a snail or mussel" , "Invertebrate with a soft unsegmented body, usually inside a shell" , "Type of invertebrate" .)
