Crossword Puzzle Some groups at protests

Clue: Some groups at protests

Atomic groups: Abbr. (MOLS with 4 letters)
Groups of atoms (MOLECULES with 9 letters)
Groups of attendants (RETINUES with 8 letters)
First-string athletic groups (ATEAMS with 6 letters)
Groups of athletes on horseback (POLOTEAMS with 9 letters)
Groups of athletes (TEAMS with 5 letters)
Someplace mighty dilapidated where top athletes compete (3,7,5) (THEOLYMPICGAMES with 15 letters)
Big attraction at a museum, maybe (TREX with 4 letters)
Athenian of drama (TIMON with 5 letters)
Atoll explosion (ATEST with 5 letters)