### Clue: Sign up Republican in party under Ford in the '70s? (9)
### Answer: CAPRICORN 
 ### Explanation: Definition: Sign up
 [ R(abbrev. for "Republican", member of the Republican Party) **contained in**(in) CON(abbrev. for the Conservative Party) ] **placed below**(under, in a down clue) CAPRI(a model of Ford cars in the 70s).
Defn: Astrological sign in the zodiac, from the constellation of stars, Capricornus.