Answer:

SILENTC

Answer	Crossword Clue
SILENTC	Czar quality?
SILENTC	Yacht feature?
SILENTC	Bit of muscle?

SILENTC	What's found in muscles, but not in mussels
SILENTC	Indictment feature?
SILENTC	Czarist leader
SILENTC	Czar attribute
SILENTC	Center of Connecticut
SILENTC	Letter of indictment?
SILENTC	Attribute of 58-A
SILENTC	Miscellaneous part?