Prior to a clipping, consider some flight training.
The Real Estate Agent's Tour and teaching safe flight paths.
When a Parrot is frightened or disturbed, they fly! That first couple of seconds is near always just GO! By providing pre-taught safe flight paths, your Parrot will switch over to those pre-taught paths!
Starting from his cage, perch, other areas in which he common sits have him step-up and walk a safe flight path out to a safe landing spot and have him step off. Let him set there for a couple of minutes and ask for a step-up and return to your starting point. The goal is to define several safe flight paths out and back from different places in which your Parrot commonly is during the day.
Once your Parrot has learned those paths and you see that in his none assisted flights, its time to teach 'hard surfaces' The goal is to teach your Parrot what 'things' out there are hard and to avoid them. Have your Parrot Step-up and start down a safe flight that vary off the path into a window and 'kind of crash' into it. take a step back and tap on the glass and state 'hard.' place his beak to the glass and state 'hard.' Do this multiple times until you see your parrot lean back and/or look at you like your crazy! Do this with windows, mirrors, pictures, doors, and walls in general. Also include safe flight paths to show the difference.
By including the above, you will begin to see that even when scared, your Parrot will quickly shift to a safe flight path.