While performing a VFR practice instrument approach if radar approach control assigns an altitude or heading that will cause you to enter the clouds then you should avoid the clouds and inform Air Traffic Control that the altitude will not permit VFR.
Visual Flight Rules(VFR) are a set of guidelines below which a pilot operates an aircraft in weather conditions usually clear enough to permit the pilot to see where the plane is going.
Air Traffic Control(ATC) is a service supplied by ground-based air traffic controllers who direct aircraft at the ground and through a given section of controlled airspace, and can offer advisory services to planes in non-controlled airspace.
When ATC issues an Instrument Flight Rules(IFR) clearance to pilots of airborne planes, pilots must reply by using reading back those parts containing altitude assignments or vectors and any part requiring verification. This is compulsory.
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