Clue: Having gone backward, Spanish car's finally gone forward – fixed! (4-6)
Answer: DEEP-SEATED
Explanation: Definition: fixed
A charade of DEEP, a reversal ('backward') of PEED ('gone') plus SEAT ('Spanish car', *Sociedad Española de Automóviles de Turismo*, manufacturer and models) plus ED ('finally gon**E** forwar**D**'). A somewhat unhelpful definition with an elaborate wordplay.