Clue: Nazi thugs arresting film star (5)
Answer: SPICA
Explanation: Definition: star
PIC (film) in SA – the *Sturmabteilung*, the original paramilitary wing of the Nazi party, aka the Brownshirts. Spica is a star in the constellation Virgo – rather an obscure clue, I thought, though fortunately the unchecked letters only involve the familiar PIC