Relatively Closed Area for Cars Prior to F1 Race

Puzzle 4 of Jane Austen Hard Pack

Question is: Relatively Closed Area for Cars Prior to F1 Race

and the answer is: PARCFERME

Word Meaning:

PARC FERMÉ — (motor racing) A secure car park where competing cars must be left, and where no maintenance, repairs, or enhancements may be performed, for example during rest periods.

Definitions from Wiktionary.