what is the time/retired when the laps is 6, the grid is less than 18 and the driver is clay regazzoni?
CREATE TABLE table_54240 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
)
SELECT "Time/Retired" FROM table_54240 WHERE "Laps" = '6' AND "Grid" < '18' AND "Driver" = 'clay regazzoni'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: what is the time/retired when the laps is 6, the grid is less than 18 and the driver is clay regazzoni? ### Input: CREATE TABLE table_54240 (
    "Driver" text,
    "Constructor" text,
    "Laps" real,
    "Time/Retired" text,
    "Grid" real
) ### Response: SELECT "Time/Retired" FROM table_54240 WHERE "Laps" = '6' AND "Grid" < '18' AND "Driver" = 'clay regazzoni'