As verbs the difference between maintain and clam
is that maintain
is (obsolete|transitive) to support (someone), to back up or assist (someone) in an action while clam
is to dig for clams or clam
can be to produce, in bellringing, a clam or clangor; to cause to clang or clam
can be to be moist or glutinous; to stick; to adhere.
As a noun clam is
a bivalve mollusk of many kinds, especially those that are edible; as, the long clam (, a huge east indian bivalve or clam
can be a crash or clangor made by ringing all the bells of a chime at once or clam
can be clamminess; moisture.