The phrase "enough clearance" means having enough space or distance to move or avoid obstacles without any problems or obstacles in the way. Full definition
With enough clearance to the left of the chart price made a run for the lows. (newtraderu.com)
Since there is not enough clearance between the rider and the passenger, there is a slight friction among the two of you during the entire ride. (babyseats.reviews)
If you're «unlucky», there's enough clearance between the piston and the valves to fit the spark plug. (mechanics.stackexchange.com)